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Stock-Based Awards (Tables) | 6 Months Ended
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Jun. 30, 2025
Stock-Based Awards |
Summary of assumptions used to determine fair value of stock options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Six Months Ended
​ | ​ | June 30,
​ | ​ | 2025 | ​ | ​ | 2024 | ​
Risk-free interest rate |  | 4.32 | % | ​ | 3.85 | %
Expected term (in years) |  | 6.2 | ​ | ​ | 6.0 | ​
Expected volatility |  | 82.71 | % | ​ | 81.95 | %
Expected dividend yield |  | 0 | % | ​ | 0 | %
Summary of stock option activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Remaining | ​ | Aggregate
​ | ​ | Number | ​ | Exercise | ​ | Contractual | ​ | Intrinsic
(In thousands, except share and per share data and years) | ​ | of Shares | ​ | Price | ​ | Term | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | (in years) | ​ | ​ | ​
Outstanding as of December 31, 2024 |  | 6,721,967 | ​ | $ | 11.12 | ​ | 6.8 | ​ | $ | 2,968
Granted |  | 4,653,495 | ​ | ​ | 2.24 | ​ | ​ | ​ | ​ | ​
Forfeited and cancelled |  | (30,500) | ​ | ​ | 9.68 | ​ | ​ | ​ | ​ | ​
Outstanding as of June 30, 2025 |  | 11,344,962 | ​ | $ | 7.54 | ​ | 7.8 | ​ | $ | 506
Options vested and expected to vest as of June 30, 2025 |  | 11,344,962 | ​ | $ | 7.54 | ​ | 7.8 | ​ | $ | 506
Options exercisable as of June 30, 2025 |  | 4,513,154 | ​ | $ | 13.77 | ​ | 5.6 | ​ | $ | 263
​
Summary of restricted stock units activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | Weighted | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​
​ | ​ | ​ | ​ | Grant Date | ​ | Aggregate
​ | ​ | Number | ​ | Fair Value | ​ | Intrinsic
(In thousands, except share and per share data) | ​ | of Shares | ​ | Per Share | ​ | Value
Outstanding as of December 31, 2024 | ​ | 2,276,151 | ​ | $ | 5.12 | ​ | ​ | ​
Granted | ​ | 1,916,880 | ​ | ​ | 2.29 | ​ | ​ | ​
Vested | ​ | (595,035) | ​ | ​ | 8.33 | ​ | $ | 1,332
Forfeited and cancelled | ​ | (12,375) | ​ | ​ | 11.38 | ​ | ​ | ​
Outstanding as of June 30, 2025 | ​ | 3,585,621 | ​ | $ | 3.05 | ​ | ​ | ​
Summary of stock-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 30, | ​ | June 30,
(In thousands) |  | 2025 |  | 2024 |  | 2025 |  | 2024
Cost of revenue |  | $ | 190 |  | $ | 223 | ​ | $ | 409 |  | $ | 475
Research and development | ​ | ​ | 1,106 | ​ | ​ | 1,097 | ​ | ​ | 2,291 | ​ | ​ | 1,068
General and administrative | ​ |  | 1,767 | ​ |  | 1,583 | ​ |  | 3,898 | ​ |  | 3,449
Total stock-based compensation expense | ​ | $ | 3,063 | ​ | $ | 2,903 | ​ | $ | 6,598 | ​ | $ | 4,992

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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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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 + Details
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