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Stock Based Compensation | 3 Months Ended
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Mar. 31, 2025
Stock Based Compensation |
Stock Based Compensation | 11. Stock-Based Compensation The Company may grant qualified and non-qualified stock options, common stock, PSUs, RSUs, and other stock-based awards under various plans to directors, officers, employees, and other individuals. Stock options are granted at exercise prices of not less than the fair market value of the Company’s common stock on the date of grant. Additionally, the Company has an ESPP that allows employees to purchase Company shares at a purchase price equal to 85% of the lower of the fair market value of the Company’s common stock on the first trading day of the purchase period or on the last day of the purchase period. The ESPP includes a rollover mechanism for the purchase price if the fair market value of the Company’s common stock on the purchase date is less than the fair market value of the Company’s common stock on the first trading day of the purchase period. Stock Options and Other Benefit Plans Stock Options Stock options issued under the 2010 Plan generally vest monthly over three years for employees and one year for directors. Stock options held by employees who qualify for retirement age (defined as employees that are a minimum of 55 years of age and the sum of their age plus years of full-time employment with the Company exceeds 70 years) vest on the earlier of scheduled vest date or the date of retirement. In addition to stock options issued under the 2010 Plan, the Company also granted inducement stock options to the Company’s CEO and CIO in January 2023. ​ The activity for all stock options for the three months ended March 31, 2025 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted |  | Weighted | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Average | ​ | Aggregate
​ | ​ | ​ | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ | ​ | Number of | ​ | Price | ​ | Remaining Term | ​ | Value
​ | ​ | shares | ​ | Per Share | ​ | (in years) | ​ | (in thousands)
Outstanding as of January 1, 2025 | ​ | ​ | 2,426,929 | ​ | $ | 20.83 |  | ​ | 5.77 | ​ | $ | 18,644
Granted |  | ​ | — | ​ |  | — |  | ​ | ​ |  | ​ |
Exercised |  | ​ | (21,000) | ​ |  | 4.03 |  | ​ | ​ |  | ​ |
Forfeited, expired or cancelled | ​ | ​ | (31,234) | ​ |  | 76.55 |  | ​ | ​ |  | ​ |
Outstanding as of March 31, 2025 | ​ | ​ | 2,374,695 | ​ | $ | 20.24 |  | ​ | 5.63 | ​ | $ | 8,266
Exercisable as of March 31, 2025 | ​ | ​ | 2,069,546 | ​ | $ | 19.69 |  | ​ | 5.32 | ​ | $ | 8,050
​ The aggregate intrinsic value of stock options exercised during the three months ended March 31, 2025 and 2024 was $0.4 million and $2.5 million, respectively. The intrinsic value is the difference between the fair value of the Company’s common stock at the time of exercise and the exercise price of the stock option. The Company recorded $0.9 million in stock-based compensation expense related to stock options during the three months ended March 31, 2025. As of March 31, 2025, $3.8 million of total unrecognized compensation expense related to stock options was expected to be recognized over a weighted-average period of 1.6 years. Performance Stock Unit Awards Since May 2023, the Company has granted employees 733,600 PSUs under the 2010 Plan. The PSUs are subject to market-based vesting conditions and the number of PSUs vested will be based on the stock price of the Company’s common stock as compared to four stock price hurdles over a three-year period from the initial May 2023 grant date (the “performance period”). A stock price hurdle is considered attained when, at any time during the performance period, the Company’s volume-weighted-average stock price equals or exceeds the hurdle stock price value for 30 consecutive calendar days. Upon attainment of a stock price hurdle, one-third of the earned PSUs will vest immediately upon achievement, one-third will vest upon the two-year anniversary of the grant date and one-third will vest on the three-year anniversary of the grant date. If no stock price hurdle is attained during the performance period, then no PSUs will vest. In connection with Mr. Hughes’ appointment to full-time Chief Executive Officer in January 2024, the Company granted Mr. Hughes 275,000 PSUs under the 2010 Plan with generally the same terms as the May 2023 PSU grants. There were no PSUs granted in the three months ended March 31, 2025. Fair Value Assumptions of Performance Stock Unit Awards ​ The fair value of the PSUs granted was estimated based on Monte Carlo valuation model which incorporates into the valuation the possibility that the stock price hurdles may not be satisfied. The grant date fair values of the PSUs granted in January 2024 was estimated as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | Derived
Hurdle Price | ​ | Number of | ​ | Fair Value | ​ | Service Period
Per PSU | ​ | PSUs | ​ | Per Share | ​ | (in years)
$ | 30.00 | ​ | ​ | 160,078 |  | $ | 18.42 | ​ | ​ | 0.74
$ | 35.00 | ​ | ​ | 53,350 |  | $ | 17.24 | ​ | ​ | 0.96
$ | 40.00 | ​ | ​ | 32,835 |  | $ | 16.14 | ​ | ​ | 1.15
$ | 45.00 | ​ | ​ | 28,737 | ​ | $ | 15.13 | ​ | ​ | 1.31
​ | ​ | ​ | ​ | 275,000 |  | ​ | ​ | ​ | ​ | ​
​ The Company estimates that it will recognize total stock-based compensation expense of approximately $11.9 million in aggregate for the PSUs granted since May 2023 using the graded expense attribution method over the requisite service period of each tranche. If the stock price hurdles are met sooner than the requisite service period, the stock-based compensation expense for the respective stock price hurdle will be accelerated. Stock-based compensation expense will be recognized over the requisite service period if the grantees continue to provide service to the Company, regardless of whether the PSU stock price hurdles are achieved. ​ The activity for all PSUs for the three months ended March 31, 2025 was as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted
​ | ​ | ​ | ​ | Average
​ | ​ | ​ | ​ | Grant Date
​ | ​ | Number of | ​ | Fair Value
​ | ​ | Unvested PSUs | ​ | Per Share
Unvested balance as of January 1, 2025 | ​ | ​ | 597,117 | ​ | $ | 16.03
Granted |  | ​ | — | ​ |  | —
Vested |  | ​ | — | ​ |  | —
Forfeited | ​ | ​ | — | ​ |  | —
Unvested balance as of March 31, 2025 | ​ | ​ | 597,117 | ​ | $ | 16.03
​ The Company recorded $1.0 million in stock-based compensation expense related to the PSUs during the three months ended March 31, 2025. As of March 31, 2025, there was $2.0 million unrecognized stock-based compensation expense related to outstanding PSUs granted to employees, with a weighted-average remaining recognition period of 0.6 years. ​ Restricted Stock Unit Awards In May 2024, the Company granted the non-employee directors of the Board an aggregate of 15,175 RSUs under the 2010 Plan. RSUs are equity awards that entitle the holder to receive freely tradeable shares of the Company’s common stock upon vesting. The RSUs vest in full on the one-year anniversary of the grant date. The fair value of the RSUs is equal to the closing price of the Company’s common stock on the grant date. The weighted-average grant-date fair value of the RSUs granted was $24.71 per RSU. As of March 31, 2025, no RSUs had vested and the unvested balance as of March 31, 2025 was 15,175 RSUs at a weighted-average grant-date fair value of $24.71 per RSU. The Company recorded $0.1 million in stock-based compensation expense related to the RSUs during the three months ended March 31, 2025. As of March 31, 2025, there was $46,000 unrecognized stock-based compensation expense related to the outstanding RSUs granted to non-employee directors, with a weighted-average remaining recognition period of 0.1 years. ​ Stock-based Compensation Expense All stock-based compensation expense is recorded in G&A expenses. The following table shows total stock-based compensation expense for stock options, PSUs, RSUs, and ESPP in the condensed consolidated statements of operations (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31,
​ | ​ | 2025 | ​ | 2024
Total stock-based compensation expense | ​ | $ | 1,983 | ​ | $ | 2,856
​

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