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Stock-Based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2025
Stock-Based Compensation |
Schedule of assumptions used in the fair value estimation of each option grant | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | September 30, | ​ | ​
​ |  | 2025 |  | 2024 |  |
Expected life (years) | ​ | 3.7 - 4.8 | ​ | 3.8 - 4.9 | ​ | ​
Risk-free interest rate |  | 3.6% - 4.0% | ​ | 3.5% - 4.5% | ​ |
Volatility | ​ | 74.4% - 82.9% | ​ | 68.9% - 74.9% | ​ | ​
Dividend yield |  | 0% | ​ | 0% | ​ |
Schedule of stock-based compensation expense related to all of our share-based payment awards | Total stock-based compensation expense related to all of our share-based payment awards is comprised of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30, | ​
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024 |
Cost of revenue | ​ | $ | 445 | ​ | $ | 616 | ​ | $ | 1,428 | ​ | $ | 1,850 | ​
Selling, general and administrative | ​ |  | 1,878 | ​ | ​ | 3,121 | ​ |  | 5,602 | ​ | ​ | 10,018 | ​
Engineering and development | ​ |  | 203 | ​ | ​ | 319 | ​ |  | 605 | ​ | ​ | 1,055 | ​
​ | ​ | $ | 2,526 | ​ | $ | 4,056 | ​ | $ | 7,635 | ​ | $ | 12,923 | ​
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, 2024 | ​ | 6,802,474 | ​ | $ | 16.38 | ​ | — | ​ | ​ | —
Granted (weighted-average fair value of $4.13 per share) | ​ | 510,864 | ​ | ​ | 6.87 | ​ | — | ​ | ​ | —
Exercised |  | (888,307) |  | ​ | 4.47 |  | — | ​ | ​ | —
Forfeited | ​ | (275,620) | ​ | ​ | 25.52 | ​ | — | ​ | ​ | —
Expired | ​ | (304,834) | ​ | ​ | 18.20 | ​ | — | ​ | ​ | —
Outstanding — September 30, 2025 |  | 5,844,577 | ​ | $ | 16.83 |  | 3.7 | ​ | $ | 7,083
Vested (exercisable) — September 30, 2025 |  | 5,127,641 | ​ | $ | 17.52 |  | 3.4 | ​ | $ | 5,923
Expected to vest after September 30, 2025 (unexercisable) |  | 716,936 | ​ | $ | 11.91 |  | 5.9 | ​ | $ | 1,160
(1) | Aggregate intrinsic value represents the difference between the exercise price of the option and the closing market price of the Company’s common stock on September 30, 2025 (the last trading day of the quarter), which was $9.48 per share.
Schedule of restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted Average
​ | ​ | Number of Restricted | ​ | Fair Value per
​ | ​ | Stock Units | ​ | Share
Outstanding — December 31, 2024 |  | 1,039,091 | ​ | $ | 21.75
Granted |  | 678,330 | ​ |  | 6.46
Share issuance |  | (383,957) | ​ |  | 25.79
Forfeited |  | (214,625) | ​ |  | 18.11
Expired | ​ | (4,019) | ​ | ​ | 6.41
Outstanding — September 30, 2025 |  | 1,114,820 | ​ | $ | 11.58

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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