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Employee Benefit Plans and Stock-based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2020
Employee Benefit Plans and Stock-based Compensation |
Summary of stock option activity | The following table summarizes the stock option transactions for each of the years ended December 31, 2018, 2019 and 2020 (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, 2018 |  | 2,666 | ​ | $ | 3.81 |  | 6.87 | ​ | $ | 13,149 | ​
Granted |  | 246 | ​ |  | 5.77 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (238) | ​ |  | 2.64 | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | (20) | ​ |  | 4.40 | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2018 |  | 2,654 | ​ | $ | 4.09 |  | 6.28 | ​ | $ | 2,720 | ​
Granted |  | 430 | ​ |  | 3.06 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (113) | ​ |  | 2.37 | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | (18) | ​ |  | 4.47 | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2019 | ​ | 2,953 | ​ | $ | 4.00 |  | 5.95 | ​ | $ | 3,040 | ​
Granted |  | — | ​ |  | — | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (905) | ​ |  | 2.80 | ​ | ​ | ​ | ​ | ​ | ​
Canceled and expired |  | (163) | ​ |  | 5.85 | ​ | ​ | ​ | ​ | ​ | ​
Balance as of December 31, 2020 |  | 1,885 | ​ | $ | 4.42 |  | 6.17 | ​ | $ | 9,713 | ​
Options vested as of December 31, 2020 and unvested options expected to vest, net of forfeitures |  | 1,872 | ​ | $ | 4.42 |  | 6.15 | ​ | $ | 9,636 | ​
Options exercisable as of December 31, 2020 |  | 1,418 | ​ | $ | 4.52 |  | 5.41 | ​ | $ | 7,165 | ​
​
Summary of options outstanding and exercisable by exercise price ranges | The options outstanding and exercisable as of December 31, 2020 were in the following exercise price ranges (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Options Vested and |
​ | ​ | ​ | ​ | ​ | ​ | Options Outstanding as of | ​ | Exercisable as of |
​ | ​ | ​ | ​ | ​ | ​ | December 31, 2020 | ​ | December 31, 2020 |
​ | ​ | ​ | ​ | ​ | ​ | ​ |  | ​ | ​ |  | Weighted‑average |  | ​ |  | ​ | ​ |
Range of | ​ | ​ | ​ | Weighted‑average |  | Remaining | ​ | ​ | ​ | Weighted‑Average |
Exercise Price | ​ | Shares | ​ | Exercise Price |  | Contractual Life | ​ | Shares | ​ | Exercise Price |
$ | 2.14 | - | $ | 2.14 | ​ | 8 | ​ | $ | 2.14 |  | 3.33 |  | 8 | ​ | $ | 2.14 | ​
$ | 2.18 | - | $ | 2.18 | ​ | 304 | ​ | $ | 2.18 |  | 4.84 |  | 304 | ​ | $ | 2.18 | ​
$ | 2.36 | - | $ | 2.91 | ​ | 162 | ​ | $ | 2.56 |  | 3.29 |  | 162 | ​ | $ | 2.56 | ​
$ | 3.06 | - | $ | 3.06 | ​ | 430 | ​ | $ | 3.06 |  | 8.85 |  | 107 | ​ | $ | 3.06 | ​
$ | 4.79 | - | $ | 4.79 | ​ | 92 | ​ | $ | 4.79 |  | 0.82 |  | 92 | ​ | $ | 4.79 | ​
$ | 5.21 | - | $ | 5.21 | ​ | 440 | ​ | $ | 5.21 |  | 5.82 |  | 440 | ​ | $ | 5.21 | ​
$ | 5.61 | - | $ | 5.61 | ​ | 20 | ​ | $ | 5.61 |  | 1.16 |  | 20 | ​ | $ | 5.61 | ​
$ | 5.77 | - | $ | 5.77 | ​ | 245 | ​ | $ | 5.77 |  | 7.85 |  | 128 | ​ | $ | 5.77 | ​
$ | 7.95 | - | $ | 7.95 | ​ | 60 | ​ | $ | 7.95 |  | 6.08 |  | 59 | ​ | $ | 7.95 | ​
$ | 9.50 | - | $ | 9.50 | ​ | 124 | ​ | $ | 9.50 |  | 6.82 |  | 98 | ​ | $ | 9.50 | ​
​ | ​ | ​ | ​ | ​ | ​ | 1,885 | ​ | $ | 4.42 |  | 6.17 |  | 1,418 | ​ | $ | 4.52 | ​
​
Summary of restricted stock awards activity | A summary of activity related to restricted stock awards for the years ended December 31, 2018, 2019 and 2020 is presented below (in thousands, except per share data):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted-Average |
​ | ​ | ​ | ​ | Grant Date |
Stock Awards |  | Shares |  | Share Value |
Non-vested as of January 1, 2018 |  | 480 | ​ | $ | 7.13 | ​
Granted |  | 344 | ​ | $ | 6.02 | ​
Vested |  | (181) | ​ | $ | 6.04 | ​
Forfeited |  | (10) | ​ | $ | 6.65 | ​
Non-vested as of December 31, 2018 |  | 633 | ​ | $ | 6.85 | ​
Granted |  | 554 | ​ | $ | 3.60 | ​
Vested |  | (228) | ​ | $ | 6.46 | ​
Forfeited |  | (20) | ​ | $ | 7.16 | ​
Non-vested as of December 31, 2019 | ​ | 939 | ​ | $ | 5.02 | ​
Granted |  | 443 | ​ | $ | 5.94 | ​
Vested |  | (347) | ​ | $ | 5.44 | ​
Forfeited | ​ | (13) | ​ | $ | 5.54 | ​
Non-vested as of December 31, 2020 |  | 1,022 | ​ | $ | 5.27 | ​
Summary of common stock reserved for future issuance | The following number of shares of common stock were reserved and available for future issuance as of December 31, 2020 (in thousands, except per share data):
​ | ​ | ​ | ​
Options outstanding |  | 1,885 | ​
Restricted stock awards outstanding |  | 1,022 | ​
Stock available for future grant: 2015 Equity Incentive Plan |  | 562 | ​
Total |  | 3,469 | ​
Summary of compensation costs related to stock-based awards |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year Ended | ​
​ | ​ | ​ | December 31, | ​
​ |  |  | 2020 |  | 2019 | ​ | 2018 |
Cost of revenue | ​ | ​ | $ | 116 | ​ | $ | 125 | ​ | $ | 92 | ​
Selling, general and administrative | ​ | ​ |  | 2,000 | ​ |  | 1,778 | ​ |  | 1,520 | ​
Research and development | ​ | ​ |  | 507 | ​ |  | 443 | ​ |  | 313 | ​
Total stock-based compensation | ​ | ​ |  | 2,623 | ​ |  | 2,346 | ​ |  | 1,925 | ​
Tax effect on stock-based compensation | ​ | ​ |  | — | ​ |  | — | ​ |  | — | ​
Net effect on net income (loss) | ​ | ​ | $ | 2,623 | ​ | $ | 2,346 | ​ | $ | 1,925 | ​
Shares used in computing basic net income (loss) per share | ​ | ​ |  | 40,152 | ​ |  | 39,487 | ​ |  | 39,049 | ​
Shares used in computing diluted net income (loss) per share | ​ | ​ |  | 41,025 | ​ |  | 39,487 | ​ |  | 40,265 | ​
Effect on basic net income (loss) per share | ​ | ​ | $ | 0.07 | ​ | $ | (0.06) | ​ | $ | 0.05 | ​
Effect on diluted net income (loss) per share | ​ | ​ | $ | 0.06 | ​ | $ | (0.06) | ​ | $ | 0.05 | ​
​
Summary of weighted-average assumptions | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended | ​
​ | ​ | December 31, | ​
​ |  | 2020 |  | ​ | 2019 |  | ​ | 2018 |
Expected term (in years) | ​ | — |  | ​ | 6.1 |  | ​ | 5.8 |
Volatility | ​ | — | % | ​ | 49.5 | % | ​ | 46.6 | %
Expected dividend | ​ | — | % | ​ | — | % | ​ | — | %
Risk-free interest rate | ​ | — | % | ​ | 1.67 | % | ​ | 3.09 | %

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