Other financial instruments, including accounts receivable, accounts payable and accrued liabilities, are carried at cost, which approximates fair value given their short-term nature.
Inventory
Inventory is valued utilizing the weighted average costing method. The Company records an inventory reserve for losses associated with dated, expired, excess or obsolete items. This reserve is based on management’s current knowledge with respect to inventory levels, planned production and sales volume assumptions. As of June 30, 2023 and December 31, 2022, inventory reserves approximated $1.1 million and $0.6 million, respectively.
Long-Lived Assets
In accordance with ASC 360, Property, Plant and Equipment, the Company’s policy is to review long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. Management does not believe the carrying values of any long-lived assets are impaired as of June 30, 2023.
Research and Development Expenses
Research and development costs are expensed as incurred. Research and development expense consists primarily of costs related to personnel, including salaries and other personnel-related expenses, expenses related to manufacturing, clinical trial expenses, consulting fees, and support services used in drug development. All research and development costs are charged to operations as incurred in accordance with ASC 730, Research and Development.
In certain circumstances, the Company is required to make advance payments to vendors for goods or services that will be received in the future for use in research and development activities. In such circumstances, the advance payments are deferred and are expensed when the activity has been performed or when the goods have been received.
Advertising Costs
The Company has elected to expense advertising costs when incurred. Advertising costs totaled zero and $1.9 million for the three months ended June 30, 2023 and 2022, respectively, and totaled zero and $5.2 million for the six months ended June 30, 2023 and 2022, respectively.
Deferred Financing Costs
Costs directly attributable to the Company’s senior secured term loan (see Note 7) are deferred and reported as a reduction of the related term loan. These costs represent legal fees and other costs related to the term loan and are being amortized utilizing the straight-line method over the term of the loan. Amortization of deferred financing costs charged to interest expense was approximately $49,000 and $66,000 for the three months ended June 30, 2023 and 2022, respectively and was approximately $102,000 and $139,000 for the six months ended June 30, 2023 and 2022, respectively.
Concentrations of Credit Risk
Financial instruments which potentially subject the Company to credit risk consist principally of cash, cash equivalents, and accounts receivable. The Company invests its cash and cash equivalents in interest-bearing accounts in United States financial institutions, the balances of which exceed federally insured limits. The Company mitigates credit risk by limiting the investment type and maturity to securities that preserve capital, maintain liquidity, and have a high credit quality. The Company has not recognized any losses from credit risks on such accounts. The Company has no financial instruments with off balance sheet risk of accounting loss.
Major customers of the Company are defined as those constituting greater than 10% of its total revenue. In the three months ended June 30, 2023, the Company had sales to four customers that individually accounted for more than 10% of its total revenue. These customers had sales of $1.3 million, $1.2 million, $1.1 million, and $0.8 million, respectively, which represented 83% of total revenues in the three months ended June 30, 2023. In the six months ended June 30, 2023, the Company had sales to four customers that individually accounted for more than