Description of Business and Summary of Significant Accounting Policies | Description of Business and Summary of Significant Accounting Policies Description of Business TuSimple Holdings, Inc. (the “Company” or “TuSimple”) is principally engaged in the operation and development of autonomous trucks and an autonomous freight network ("AFN"). The Company is headquartered in San Diego, California. TuSimple was originally incorporated as Tusimple (Cayman) Limited, a limited liability company in the Cayman Islands, on October 25, 2016. In February 2021, the Company deregistered as a Cayman Islands exempted company and continued and domesticated as a corporation incorporated under the laws of the State of Delaware (the “Domestication”). The business, assets and liabilities of the Company and its subsidiaries on a consolidated basis, as well as its principal locations and fiscal year, were the same immediately after the Domestication as they were immediately prior to the Domestication. In addition, the directors and executive officers of the Company immediately after the Domestication were the same individuals who were directors and executive officers, respectively, of the Company immediately prior to the Domestication. Initial Public Offering and Private Placement On April 19, 2021, the Company closed its initial public offering (“IPO”) and concurrent private placement, in which it issued and sold 27,027,027 shares and 874,999 shares, respectively, of its authorized Class A common stock at $40.00 per share, resulting in net proceeds of $1.0 billion after deducting underwriting discounts and commissions of $50.1 million and offering costs. Immediately prior to the closing of the IPO, (i) the Company filed an amended and restated certificate of incorporation, which authorized 4,876,000,000 shares of Class A common stock and reclassified all outstanding common stock into Class A common stock, authorized 24,000,000 shares of Class B common stock, which are not publicly traded, and authorized 100,000,000 shares of undesignated preferred stock, (ii) Xiaodi Hou and Mo Chen (the “Founders”) each exchanged 12,000,000 shares of their newly designated Class A common stock for an equivalent number of shares of Class B common stock, and (iii) all shares of the Company’s outstanding redeemable convertible preferred stock automatically converted into 120,534,419 shares of Class A common stock. The rights of the holders of Class A common stock and Class B common stock are identical, except with respect to voting, conversion, and transfer rights. The holders of Class A common stock are entitled to one vote per share and the holders of Class B common stock are entitled to 10 votes per share Additionally, each share of Class B common stock will automatically convert, on a one-for-one basis, into shares of Class A common stock on the earliest of (i) the date specified by a vote of the holders of Class B common stock representing 75% of the outstanding shares of Class B common stock, (ii) the date that is between 90 days and 270 days, as determined by the board of directors, after the death or incapacitation of the last Founder to die or become incapacitated, or (iii) the date that is between 61 days and 180 days, as determined by the board of directors, after the date on which the number of outstanding shares of Class B common stock held by the Founders (or their permitted affiliates) is less than 12,000,000 shares. Upon the closing of the IPO, the Company recognized $42.6 million of stock-based compensation expense related to stock options, restricted stock units (“RSUs”), and share value awards (“SVAs”), for which the time-based vesting conditions had been satisfied or partially satisfied and the performance-based conditions were satisfied upon the closing of the IPO. Additionally, the Company recorded $4.3 million within operating expenses to former employees in connection with post-employment agreements for which payment was contingent upon the occurrence of an IPO or Sale Event (as such terms are defined in the post-employment agreements). Basis of Presentation and Consolidation The accompanying consolidated financial statements (“Financial Statements”) have been prepared in accordance with accounting principles generally accepted in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding financial reporting. The consolidated financial statements include the accounts of the Company and its consolidated subsidiaries. All significant intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Significant items subject to such estimates and assumptions include, but are not limited to, the useful lives of long-lived assets, the valuation of stock-based compensation, the fair value of preferred share warrants and related party convertible loans, the measurement of deferred tax assets, the recoverability of long-lived assets, and the fair value of equipment under capital leases. On an ongoing basis, management evaluates these estimates and assumptions; however, actual results could materially differ from these estimates. Cash, Cash Equivalents, and Restricted Cash Cash and cash equivalents consist of cash in banks and highly liquid investments, primarily certificates of deposit, purchased with an original maturity of three months or less. Restricted cash is pledged as security for letters of credit or other collateral amounts established by the Company for certain lease obligations, corporate credit cards, and other contractual arrangements. Restricted cash is recorded as prepaid expenses and other current assets in the consolidated balance sheets based on the term of the remaining restriction. Fair Value Measurements Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company measures financial assets and liabilities at fair value at each reporting period using a fair value hierarchy which requires the Company to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. A financial instrument’s classification within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. The levels of inputs used to measure fair value are: • Level 1 — Observable inputs such as quoted prices in active markets for identical assets or liabilities. • Level 2 — Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active or inputs other than the quoted prices that are observable either directly or indirectly for the full term of the assets or liabilities. • Level 3 — Unobservable inputs in which there is little or no market data that are significant to the fair value of the assets or liabilities. The Company’s primary financial instruments include cash equivalents, accounts receivable, accounts payable, amounts due to and from related parties, amounts due to joint development partners, accrued expenses, short-term and long-term debt, the related party convertible loan and the warrants liability. The estimated fair value of cash equivalents, accounts receivable, accounts payable, short-term debt, and accrued expenses approximates their carrying value due to the short-term nature of these instruments. Amounts due from related parties is comprised of a guarantee deposit paid in cash, which approximates fair value. Amounts due to related parties approximate fair value due to the short-term nature of these instruments. The warrants liability and related party convertible loan are stated at fair value on a recurring basis. Refer to Note 3. Fair Value Measurements and Note 6. Debt for further information. Accounts Receivable, Net Accounts receivable are recorded at invoiced amounts, net of allowance for doubtful accounts, and do not bear interest. The allowance for doubtful accounts is based on the Company’s assessment of the collectability of accounts. The Company regularly reviews the adequacy of the allowance for doubtful accounts based on a combination of factors. In establishing any required allowance, the Company considers historical losses adjusted to take into account current market conditions and customers’ financial condition, the amount of any receivables in dispute, the current receivables aging, and the current payment terms. Accounts receivable deemed uncollectible are charged against the allowance for doubtful accounts when identified. As of December 31, 2020 and 2021 the allowance for doubtful accounts was immaterial. Property and Equipment, Net Property and equipment, net, are stated at cost less accumulated depreciation or amortization and any recorded impairment. Property and equipment under capital leases are initially recorded at the present value of minimum lease payments. Depreciation and amortization is computed using the straight-line method over the estimated useful lives of the assets, as follows: Property and Equipment Estimated Useful Life Electronic equipment 1-4 years Vehicles 5-6 years Office and other equipment 4-6 years Leasehold improvements Shorter of lease term or estimated useful life of the asset When assets are retired or otherwise disposed of, the cost, accumulated depreciation and amortization are removed from the accounts and any resulting gain or loss is reflected in the consolidated statements of operations in the period realized. Maintenance and repairs that do not enhance or extend the asset’s useful life are charged to operating expense as incurred. Assets acquired under a capital lease are amortized in a manner consistent with the Company’s depreciation policy for owned assets if the lease transfers ownership to the Company by the end of the lease term or contains a bargain purchase option. Otherwise, assets acquired under a capital lease are amortized over the lease term. Intangible Assets, Net Intangible assets represent patents, which are carried at cost and amortized on a straight-line basis over their estimated useful lives of 20 years and presented within other assets in the Company’s consolidated balance sheet. The Company reviews intangible assets for impairment under the long-lived asset model described in the Impairment of Long-Lived Assets section. There have been no impairment charges recorded in any of the periods presented in the accompanying consolidated financial statements. As of December 31, 2020 and 2021, intangible assets are immaterial. Impairment of Long-Lived Assets The Company evaluates long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Recoverability of assets held and used is measured by comparison of the carrying amount of an asset or asset group to estimated undiscounted future cash flows expected to be generated by the asset or asset group. If the carrying amount of an asset or asset group exceeds estimated undiscounted future cash flows, then an impairment charge is recognized based on the excess of the carrying amount of the asset or asset group over its fair value. There were no impairment charges recognized related to long-lived assets during the periods presented in the accompanying consolidated financial statements. Leases The Company categorizes leases at their inception as either operating or capital leases. As the lessee, a lease is a capital lease if any of the following conditions exists: a) ownership is transferred to the lessee by the end of the lease term, b) there is a bargain purchase option, c) the lease term is at least 75% of the property’s estimated remaining economic life, or d) the present value of the minimum lease payments at the beginning of the lease term is 90% or more of the fair value of the leased property to the lessor at the inception date. A capital lease is accounted for as if there was an acquisition of an asset and an incurrence of an obligation at the inception of the lease. As of December 31, 2020 and 2021, assets under capital leases represent semi-trucks used for research and development and providing freight capacity services. Refer to Note 7. Commitments and Contingencies for further information. All other leases are accounted for as operating leases wherein lease costs are recognized on a straight-line basis once control of the space is obtained, without regard to deferred payment terms such as rent holidays that defer the commencement date of required payments or escalating rents. Additionally, incentives received are treated as a reduction of costs over the term of the agreement. Revenue Recognition On January 1, 2019, the Company adopted Accounting Standards Update (“ASU”) No. 2014-09, Revenue from Contracts with Customers (“Topic 606”) as discussed further in Recently Adopted Accounting Pronouncements below. Topic 606 establishes a principle for recognizing revenue upon the transfer of promised goods or services to customers, in an amount that reflects the expected consideration received in exchange for those goods or services. Topic 606 also includes Subtopic 340-40, Other Assets and Deferred Costs—Contracts with Customers, which requires the deferral of incremental costs of obtaining a contract with a customer. The impact of adopting Topic 606 on the Company’s revenue is not material to any of the periods presented. The Company recognizes revenue primarily from providing freight capacity services. Revenue is recognized when the customer obtains control of promised services in an amount that reflects the consideration the Company expects to receive in exchange for those services. To date, the Company has not generated revenue from carrier-owned services. Satisfaction of Performance Obligation A performance obligation is a promise in a contract to transfer a distinct good or service to the customer and is the basis of revenue recognition in accordance with GAAP. To determine the proper revenue recognition method for contracts, the Company evaluates whether two or more contracts should be combined and accounted for as one single contract and whether the combined or single contract should be accounted for as more than one performance. For most of the Company’s contracts, the customer contracts with the Company to provide distinct services within a single contract, such as freight capacity services. The majority of the Company’s contracts with customers for freight capacity services include only one performance obligation, the freight capacity services. However, if a contract is separated into more than one performance obligation, the Company allocates the total transaction price to each performance obligation in an amount based on the estimated relative standalone selling prices of the promised goods or services underlying each performance obligation. The Company frequently sells standard freight capacity services with observable standalone sales prices. In these instances, the observable standalone sales are used to determine the standalone selling price. For freight capacity services, revenue is recognized over time as the Company performs the services in the contract because of the continuous transfer of control to the customer. The Company’s customers receive the benefit of the Company’s services as the goods are transported from one location to another. If the Company were unable to complete delivery to the final location, another entity would not need to re-perform the freight capacity service already performed. As control transfers over time, revenue is recognized based on the extent of progress towards completion of the performance obligation. The selection of the method to measure progress towards completion requires judgment and is based on the nature of the products or services to be provided. Management estimates the progress based on mileage completed to total mileage to be transported. Revenues are recorded net of value-added taxes and surcharges. Contract Modification Contracts may be modified to account for changes in the rates the Company charges its customers or to add additional distinct services. The Company considers contract modifications to exist when the modification either creates new enforceable rights and obligations or alters the existing arrangement. Contract modifications that add distinct goods or services are treated as separate performance obligations. Contract modifications that do not add distinct goods or services typically change the price of existing services. These contract modifications are accounted for prospectively as the remaining performance obligations are executed. Contract Assets and Liabilities Contract assets include billed and unbilled amounts resulting from in-transit packages, as the Company has an unconditional right to payment only once all performance obligations have been completed (e.g., packages have been delivered). Contract assets are generally classified as current and the full balance is converted each quarter based on the short-term nature of the transactions. The Company’s contract liabilities consist of advance payments and billings in excess of revenue. The full balance of contract liabilities is converted each quarter based on the short-term nature of the transactions. The Company did not have any contract assets or contract liabilities as of December 31, 2020 and 2021, respectively. Payment Terms Under the typical payment terms of the Company’s customer contracts, the customer pays at periodic intervals (i.e. every 14 days, 30 days etc.) for shipments included on invoices received. It is not customary business practice to extend payment terms past 90 days, and as such, the Company does not have a practice of including a significant financing component within its contracts with customers. Contract Costs Incremental costs of obtaining contracts are expensed as incurred if the amortization period of the assets is one year or less. These costs are included within cost of revenue in the consolidated statements of operations. Disaggregation of Revenue and Remaining Performance Obligations The Company earns all of its revenue within the U.S. and there is no revenue related to any other geographies. Additionally, due to the short-term nature of the Company’s contracts, there are no remaining unsatisfied performance obligations as of December 31, 2021. Cost of Revenue Cost of revenue consists primarily of fuel costs, insurance costs, depreciation of property and equipment (including semi-trucks acquired under capital leases), labor costs and other costs directly attributable to providing freight capacity services. Software Development Costs The Company evaluates capitalization of certain software development costs subsequent to the establishment of technological feasibility. Based on the Company’s product development process and substantial development risks, technological feasibility for the Company's purpose-built L4 autonomous semi-trucks and supporting applications has not been established. Accordingly, the Company has charged all such costs to research and development expense in the period incurred. Research and Development Research and development costs consist primarily of personnel-related expenses, including stock-based compensation costs, associated with software developers and engineering personnel and consultants responsible for the design, development, and testing of the Company’s autonomous truck driving solutions, depreciation of equipment used in research and development, and allocated overhead costs. Research and development costs are expensed as incurred. Selling, General and Administrative Selling, general and administrative costs consist primarily of personnel-related expenses, including stock-based compensation costs, associated with the Company’s sales, marketing, management and administration activities, professional service fees, advertising expenses, sponsorship, public relations and other related marketing activities, and other general corporate expenses. Selling, general and administrative costs are expensed as incurred. Stock-Based Compensation The Company accounts for stock-based compensation expense in accordance with the fair value recognition and measurement provisions of GAAP, which requires compensation cost for the grant-date fair value of stock-based awards to be recognized over the requisite service period. The Company determines the fair value of stock-based awards granted or modified on the grant date (or modification date, if applicable) at fair value, using appropriate valuation techniques. Time-Based Service Awards For stock-based awards with time-based vesting conditions only, generally being RSUs and stock options, stock-based compensation is recognized straight-line over the requisite service period, which is generally four years. The fair value of RSUs is measured on the grant date based on the fair value of the underlying common stock. The fair value of stock option awards is estimated on the grant date using the Black-Scholes option-pricing model which incorporates various assumptions, including the fair value of the underlying common stock, the expected stock price volatility over the term of the award, the risk-free interest rate for the expected term of the award and the expected dividends. The Company accounts for forfeitures as they occur. Performance-Based Awards The Company has granted RSUs, SVAs, and stock options that vest only upon the satisfaction of both time-based service and performance-based conditions. The time-based service condition for these awards generally is satisfied over four years. The performance-based conditions, other than with respect to the CEO Performance Award discussed in Note 9. Stock Based Compensation, are satisfied upon the occurrence of a qualifying event, defined as the earlier of (i) the closing of certain specific liquidation or change in control transactions, or (ii) an IPO. The Company records stock-based compensation expense for performance-based equity awards such as RSUs, SVAs, and stock options using the accelerated attribution method over the requisite service period, which is generally four years, and only if performance-based conditions are considered probable to be satisfied. Upon completion of the IPO, the Company recorded a cumulative one-time stock-based compensation expense determined using the grant-date fair values. Stock-based compensation related to remaining time-based service after the qualifying event is recorded over the remaining requisite service period. For performance-based RSUs and SVAs, the Company determines the grant-date fair value as the fair value of the Company’s common stock on the grant date. For performance-based stock options, the Company determines the grant-date fair value using the Black-Scholes option-pricing model described above. For the CEO Performance Award with a vesting schedule based entirely on the attainment of both performance and market conditions, stock-based compensation expense associated with each tranche is recognized over the longer of (i) the expected achievement period for the operational milestones for such tranche and (ii) the expected achievement period for the related market capitalization milestone determined on the grant date, beginning at the point in time when the relevant operational milestones are considered probable of being met. If such operational milestones become probable any time after the grant date, the Company will recognize a cumulative catch-up expense from the grant date to that point in time. If the related market capitalization milestone is achieved earlier than its expected achievement period, then the stock-based compensation expense will be recognized over the expected achievement period for the operational milestones, which may accelerate the rate at which such expense is recognized. The fair value of such awards is estimated on the grant date using Monte Carlo simulations. Refer to Note 9. Stock Based Compensation for further information. Employee Stock Purchase Plan ("ESPP") The Company recognizes stock-based expense related to shares issued pursuant to the ESPP on a straight-line basis over the offering period. The ESPP provides for six-month offering periods. The ESPP allows eligible employees to purchase shares of Class A common stock at a 15% discount on the lower of our stock price on either (i) the offering period beginning date or (ii) the purchase date. No employee may purchase shares under the ESPP at a rate in excess of $25,000 worth of Class A common stock based on the fair market value per share of Class A common stock at the beginning of an offering for each calendar year such purchase right is outstanding or 1,500 shares. The Company estimates the fair value of shares to be issued under the ESPP based on a combination of options valued using the Black-Scholes option-pricing model. Volatility is determined over an expected term of six months based on the Company's historical volatility. The expected term is estimated based on the contractual term. Income Taxes Current income taxes are provided for in accordance with the relevant statutory tax laws and regulations. Income taxes are accounted for under the asset and liability method of accounting. Under this method, deferred tax assets and liabilities are determined based on the differences between the financial reporting and the tax bases assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the differences are expected to reverse. A valuation allowance is provided when it is more likely than not that a deferred tax asset will not be fully realized. Due to our lack of earnings history, the net deferred tax assets have been fully offset by a valuation allowance. The Company records liabilities related to uncertain tax positions when, despite the Company’s belief that the Company’s tax return positions are supportable, the Company believes that it is more likely than not that those positions may not be fully sustained upon review by tax authorities. Accrued interest and penalties related to unrecognized tax benefits are classified as income tax expense. The Company did not recognize a liability for uncertain tax positions as of December 31, 2020 and 2021 due to the availability of net operating loss and tax credit carryforwards. Foreign Currency The functional currency of the Company’s foreign subsidiaries is the local currency or U.S. dollar depending on the nature of the subsidiaries’ activities. Foreign currency transactions recognized in the consolidated statements of operations are converted to the functional currency by applying the exchange rate prevailing on the date of the transaction. Monetary assets and liabilities denominated in currencies other than the functional currency are remeasured monthly using the month-end exchange rate. Gains and losses resulting from foreign currency transactions and the effects of remeasuring monetary assets and liabilities are recorded in other income in the consolidated statements of operations. Subsidiary assets and liabilities with non-U.S. dollar functional currencies are translated at the month-end rate, retained earnings and other equity items are translated at historical rates, and revenues and expenses are translated at average exchange rates during the year. Cumulative translation adjustments are recorded within accumulated other comprehensive loss, a separate component of stockholders’ equity (deficit). Comprehensive Loss Comprehensive loss consists of two components: net loss and other comprehensive loss. Other comprehensive loss refers to losses that are recorded as an element of stockholders’ equity (deficit) and are excluded from net loss. The Company’s other comprehensive loss is composed of foreign currency translation adjustments. Net Loss Per Share Attributable to Common Stockholders The Company computes net loss per share using the two-class method required for participating securities. The two-class method requires income available to common stockholders for the period to be allocated between common stock and participating securities based upon their respective rights to receive dividends as if all income for the period had been distributed. Prior to conversion to common stock upon the Company's IPO, the holders of the redeemable convertible preferred stock would have been entitled to dividends in preference to common stockholders, at a rate no less than the rate at which dividends are paid to common stockholders, prior to any payment of dividends to common stockholders. These participating securities do not contractually require the holders of such shares to participate in the Company’s losses. As such, net losses for the periods presented were not allocated to the redeemable convertible preferred stock. The Company’s basic net loss per share attributable to common stockholders is calculated by dividing net loss attributable to common stockholders by the weighted-average number of shares of common stock outstanding for the period, without consideration of potentially dilutive securities. The diluted net loss per share is calculated by giving effect to all potentially dilutive securities outstanding for the period using the treasury stock method or the if-converted method based on the nature of such securities. Diluted net loss per share is the same as basic net loss per share in periods when the effects of potentially dilutive common stock are anti-dilutive. Segment Information The Company operates in one operating segment. Operating segments are defined as components of an enterprise about which separate financial information is evaluated regularly by the chief operating decision maker (“CODM”), which is the management committee of the board of directors, in deciding how to allocate resources and assessing performance. The CODM allocates resources and assess performance based upon consolidated financial information. Commitments and Contingencies In the normal course of business, the Company is subject to loss contingencies, such as legal proceedings arising out of its business, that cover a wide range of matters. An accrual for a loss contingency is recognized when it is probable that a liability has been incurred and the amount of loss can be reasonably estimated. If a potential material loss contingency is not probable but is reasonably possible, or is probable but cannot be estimated, then the nature of the contingent liability, together with an estimate of the range of possible loss if determinable and material, is disclosed. Reclassifications Certain prior period balances have been reclassified to conform to the current period presentation in the consolidated financial statements and the accompanying notes. Restricted cash has been reclassified to prepaid expenses and other current assets, accrued expenses incurred under joint development agreements have been reclassified to be presented separately from amounts due to related parties, and sales and marketing expense have been reclassified to selling, general and administrative expense. Recently Adopted Accounting Pronouncements In August 2018, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2018-15, Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that Is a Service Contract , which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The Company adopted the guidance as of January 1, 2021 with no material impact to the Financial Statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes . This ASU simplifies the accounting for income taxes by eliminating some exceptions to the general approach in ASC 740, Income Taxes, for recognizing deferred taxes for investments, performing intraperiod allocation and calculating income taxes in interim periods. The Com |