For the three and nine months ended September 30, 2022 and 2021, the Company recorded stock-based compensation expense as follows (in thousands):
| | | | | | | | | | | | | | | | |
| | Three months ended September 30, | | | Nine months ended September 30, | |
| | | | | | | | | | | | |
Research and development | | $ | 450 | | | $ | 428 | | | $ | 1,307 | | | $ | 1,193 | |
Selling, general and administrative | | | 1,605 | | | | 1,084 | | | | 4,674 | | | | 3,408 | |
| | | | | | | | | | | | | | | | |
Total stock-based compensation | | $ | 2,055 | | | $ | 1,512 | | | $ | 5,981 | | | $ | 4,601 | |
| | | | | | | | | | | | | | | | |
As of September 30, 2022, there were outstanding stock options to purchase 12,516,584 shares of common stock, of which stock options to purchase 8,124,977 shares of common stock were exercisable.
During the three and nine months ended September 30, 2022, the Company granted seven-year term options to purchase an aggregate of 12,000 and 455,000 shares, respectively, of the Company’s common stock to employees. The Company recorded stock-based compensation related to stock options totaling $1.6 million and $4.8 million, respectively, during the three and nine months ended September 30, 2022.
During the three and nine months ended September 30, 2021, the Company granted seven-year term options to purchase an aggregate of 400,000 and 1,030,000 shares, respectively, of the Company’s common stock to employees. The Company recorded stock-based compensation related to stock options totaling $1.4 million and $4.2 million, respectively, during the three and nine months ended September 30, 2021.
During the three and nine months ended September 30, 2022, options to purchase 1,355,335 shares and 2,064,700 shares, respectively, of the Company’s common stock were exercised, with proceeds of $4.0 million and $6.4 million respectively, to the Company.
During the three and nine months ended September 30, 2021, options to purchase 941,164 shares and 1,114,494 shares, respectively, of the Company’s common stock were exercised, with proceeds of $3.0 million and $3.4 million respectively, to the Company.
As of September 30, 2022, there was approximately $8.3 million of unrecognized compensation expense related to
non-vested
stock option awards granted under the 2014 and 2018 Stock Incentive Plans. The cost is expected to be recognized over a weighted average period of approximately 2.0 years.
There were no grants of restricted stock units to employees or directors during the three months ended September 30, 2022. The Company granted 474,500
restricted stock units during the nine months ended September 30, 2022. There were no grants of restricted stock units to employees or directors during the three or nine months ended September 30, 2021. During the three and nine months ended September 30, 2022, the Company recorded non-cash stock-based compensation expense related to restricted stock units totaling
$0.4 million and $1.1 million, respectively. During the three and nine months ended September 30, 2021, the Company recorded
non-cash
stock-based compensation expense related to restricted stock units totaling $0.1 million and $0.4 million, respectively.
As of September 30, 2022, there was approximately $3.0 million of unrecognized compensation expense related to
non-vested
restricted stock units granted under the 2018 Stock Incentive Plan. The cost is expected to be recognized over a weighted average period of approximately 2.3 years.
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