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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2022
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 | ​
​ | ​ | ​ | March 31, | ​
​ |  |  | 2022 |  | 2021 |
Cost of revenue | ​ | ​ | $ | 113 | ​ | $ | 39 | ​
Selling, general and administrative | ​ | ​ |  | 811 | ​ |  | 640 | ​
Research and development | ​ | ​ |  | 164 | ​ |  | 137 | ​
Total stock-based compensation | ​ | ​ |  | 1,088 | ​ |  | 816 | ​
Tax effect on stock-based compensation | ​ | ​ |  | — | ​ |  | — | ​
Net effect on net income | ​ | ​ | $ | 1,088 | ​ | $ | 816 | ​
Summary of stock option activity | The following table summarizes the stock option transactions during the three months ended March 31, 2022 (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, 2022 |  | 1,378 | ​ | $ | 4.83 |  | 5.60 | ​ | $ | 5,573 | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Balance as of March 31, 2022 |  | 1,378 | ​ | $ | 4.83 |  | 5.36 | ​ | $ | 3,383 | ​
Options vested as of March 31, 2022 and unvested options expected to vest, net of forfeitures |  | 1,376 | ​ | $ | 4.83 |  | 5.35 | ​ | $ | 3,371 | ​
Options exercisable as of March 31, 2022 |  | 1,140 | ​ | $ | 5.10 |  | 4.92 | ​ | $ | 2,547 | ​
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the three months ended March 31, 2022 is presented below (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant Date |
Stock Awards |  | Shares |  | Share Value |
Non-vested as of January 1, 2022 | ​ | 875 | ​ | $ | 6.26 | ​
Granted |  | 2 | ​ | $ | 9.05 | ​
Vested |  | (9) | ​ | $ | 11.60 | ​
Forfeited | ​ | (8) | ​ | $ | 5.21 | ​
Non-vested as of March 31, 2022 |  | 860 | ​ | $ | 6.22 | ​
Summary of unvested at-risk performance shares | A summary of the status of our unvested at-risk, performance shares as of March 31, 2022 is presented below (in thousands, except per share data): ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average
​ | ​ | ​ | ​ | Grant Date
Stock Awards |  | Shares* |  | Share Value
Non-vested as of January 1, 2022 | ​ | 114 | ​ | $ | 15.37
Granted |  | 74 | ** | $ | 10.91
Vested |  | — | ​ | $ | —
Forfeited | ​ | — | ​ | $ | —
Non-vested as of March 31, 2022 |  | 188 | ​ | $ | 12.42
​ *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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