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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2023
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, | ​
​ |  | 2023 |  | 2022 |  | 2023 |  | 2022 |
Cost of revenue | ​ | $ | 103 | ​ | $ | 113 | ​ | $ | 208 | ​ | $ | 226 | ​
Selling, general and administrative | ​ |  | 655 | ​ |  | 859 | ​ |  | 1,287 | ​ |  | 1,674 | ​
Research and development | ​ |  | 154 | ​ |  | 162 | ​ |  | 332 | ​ |  | 325 | ​
Net effect on net income (loss) | ​ | $ | 912 | ​ | $ | 1,134 | ​ | $ | 1,827 | ​ | $ | 2,225 | ​
Summary of stock option activity | The following table summarizes the stock option transactions during the six months ended June 30, 2023 (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, 2023 | ​ | 1,206 | ​ | $ | 5.09 |  | 5.08 | ​ | $ | 630 | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (4) | ​ | ​ | 2.30 | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | (2) | ​ | ​ | 4.79 | ​ | ​ | ​ | ​ | ​ | ​
Balance as of June 30, 2023 |  | 1,200 | ​ | $ | 5.10 |  | 4.59 | ​ | $ | 228 | ​
Options vested as of June 30, 2023 and unvested options expected to vest, net of forfeitures |  | 1,200 | ​ | $ | 5.10 |  | 4.59 | ​ | $ | 228 | ​
Options exercisable as of June 30, 2023 |  | 1,143 | ​ | $ | 5.20 |  | 4.51 | ​ | $ | 207 | ​
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the six months ended June 30, 2023 is presented below (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant Date |
Stock Awards |  | Shares |  | Share Value |
Non-vested as of January 1, 2023 | ​ | 984 | ​ | $ | 5.55 | ​
Granted |  | 90 | ​ | $ | 3.65 | ​
Vested |  | (141) | ​ | $ | 5.89 | ​
Forfeited | ​ | (3) | ​ | $ | 5.40 | ​
Non-vested as of June 30, 2023 |  | 930 | ​ | $ | 5.31 | ​
Summary of unvested at-risk performance shares | A summary of the status of our unvested at-risk, performance shares as of June 30, 2023 is presented below (in thousands, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ | ​ | Grant Date
Stock Awards |  | Shares |  | Share Value
Non-vested as of January 1, 2023 | ​ | 76 | ​ | $ | 15.37
Granted |  | 13 | ​ | $ | 3.71
Vested |  | — | ​ | $ | ​
Forfeited | ​ | — | ​ | $ | ​
Non-vested as of June 30, 2023 |  | 89 | ​ | $ | 13.71
​ *The number of shares presented is based on achieving 150% of the targeted financial performance metric as defined in the at-risk, performance shares agreement. ​ ** The first annual vesting was reported in Q4 2021, when 25% of the at-risk performance shares became eligible subject to review and confirmation by the Compensation Committee after year-end results were certified.

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