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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Stock-Based Compensation |
Summary of compensation costs related to stock-based awards | The following table summarizes compensation costs related to our stock-based awards (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
​ |  | 2024 |  | 2023 |  | 2024 |  | 2023 |
Cost of revenue | ​ | $ | 68 | ​ | $ | 103 | ​ | $ | 173 | ​ | $ | 208 | ​
Selling, general and administrative | ​ |  | 526 | ​ |  | 655 | ​ |  | 1,079 | ​ |  | 1,287 | ​
Research and development | ​ |  | 121 | ​ |  | 154 | ​ |  | 272 | ​ |  | 332 | ​
Net effect on net loss | ​ | $ | 715 | ​ | $ | 912 | ​ | $ | 1,524 | ​ | $ | 1,827 | ​
Summary of stock option activity | The following table summarizes the stock option transactions during the six months ended June 30, 2024 (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted- | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ | ​ |  | average |  | ​ | ​ |
​ | ​ | ​ | ​ | Weighted- | ​ | Remaining | ​ | ​ | ​ |
​ | ​ | Number of | ​ | average | ​ | Contractual | ​ | Aggregate |
​ | ​ | Options | ​ | Exercise | ​ | Life | ​ | Intrinsic |
Stock Options |  | Outstanding |  | Price |  | (in years) |  | Value |
Balance as of January 1, 2024 | ​ | 1,198 | ​ | $ | 5.10 |  | 4.09 | ​ | $ | 14 | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (11) | ​ | ​ | 2.22 | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Balance as of June 30, 2024 |  | 1,187 | ​ | $ | 5.13 |  | 3.63 | ​ | $ | 189 | ​
Options vested as of June 30, 2024 and unvested options expected to vest, net of forfeitures |  | 1,187 | ​ | $ | 5.13 |  | 3.63 | ​ | $ | 189 | ​
Options exercisable as of June 30, 2024 |  | 1,187 | ​ | $ | 5.13 |  | 3.63 | ​ | $ | 189 | ​
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the six months ended June 30, 2024 is presented below (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant Date |
Stock Awards |  | Shares |  | Share Value |
Non-vested as of January 1, 2024 | ​ | 1,220 | ​ | $ | 3.75 | ​
Granted |  | 85 | ​ | $ | 3.47 | ​
Vested |  | (165) | ​ | $ | 5.05 | ​
Forfeited | ​ | (4) | ​ | $ | 3.20 | ​
Non-vested as of June 30, 2024 |  | 1,136 | ​ | $ | 3.54 | ​
Summary of unvested at-risk performance shares | A summary of the status of our unvested at-risk, performance shares as of June 30, 2024 is presented below (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ | ​ | Grant Date
Stock Awards |  | Shares |  | Share Value
Non-vested as of January 1, 2024 | ​ | 38 | ​ | $ | 15.37
Granted (1) |  | 151 | ​ | $ | 2.28
Vested |  | — | ​ | $ | —
Forfeited | ​ | — | ​ | $ | —
Non-vested as of June 30, 2024 |  | 189 | ​ | $ | 4.91
​
| (1) | The number of shares presented is based on achieving 100% of the targeted financial performance metric as defined in the at-risk, performance shares agreement.

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