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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2024
Stock-Based Compensation |
Schedule of assumptions used in the fair value estimation of each option grant | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​
​ |  | 2024 |  | 2023 |
Expected life (years) | ​ | 3.8 - 4.9 | ​ | 4.2 - 5.2 | ​
Risk-free interest rate |  | 4.3% - 4.4% | ​ | 3.5% - 3.6% | ​
Volatility | ​ | 69.5% - 69.5% | ​ | 73.0% | ​
Dividend yield |  | 0% | ​ | 0% | ​
Schedule of stock-based compensation expense related to all of our share-based payment awards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended March 31, | ​
​ |  | 2024 |  | 2023 |
Cost of revenue | ​ | $ | 669 | ​ | $ | 475 | ​
Selling, general and administrative | ​ |  | 4,378 | ​ | ​ | 4,304 | ​
Engineering and development | ​ |  | 409 | ​ | ​ | 405 | ​
​ | ​ | $ | 5,456 | ​ | $ | 5,184 | ​
Schedule of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted- | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Number of | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
​ |  | Shares |  | Price/Share |  | Term (Years) |  | Value (1)
Outstanding — December 31, 2023 | ​ | 7,224,820 | ​ | $ | 15.88 | ​ | — | ​ | ​ | —
Granted (weighted-average fair value of $8.72 per share) | ​ | 168,611 | ​ | ​ | 15.88 | ​ | — | ​ | ​ | —
Exercised |  | (115,864) |  | ​ | 5.34 |  | — | ​ | ​ | —
Forfeited | ​ | (37,639) | ​ | ​ | 36.91 | ​ | — | ​ | ​ | —
Outstanding — March 31, 2024 |  | 7,239,928 | ​ | $ | 15.94 |  | 4.1 | ​ | $ | 43,542
Vested (exercisable) — March 31, 2024 |  | 6,422,781 | ​ | $ | 14.34 |  | 3.9 | ​ | $ | 43,122
Expected to vest after March 31, 2024 (unexercisable) |  | 817,147 | ​ | $ | 28.49 |  | 4.1 | ​ | $ | 419
(1) | Aggregate intrinsic value represents the difference between the exercise price of the option and the closing market price of our common stock on March 28, 2024 (the last trading day of the quarter), which was $17.70 per share.
Schedule of restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted Average
​ | ​ | Number of Restricted | ​ | Fair Value per
​ | ​ | Stock Units | ​ | Share
Outstanding – December 31, 2023 |  | 1,076,629 | ​ | $ | 27.73
Granted |  | 334,820 | ​ |  | 15.18
Share issuance |  | (169,904) | ​ |  | 17.03
Forfeited |  | (34,222) | ​ |  | 26.38
Outstanding – March 31, 2024 |  | 1,207,323 | ​ | $ | 22.74

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