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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Stock-Based Compensation. |
Schedule summarizing stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan | Stock Options The following table summarizes stock option activity under the 2001 Stock Plan, 2011 Stock Plan and 2015 Stock Plan:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | ​ |  | ​ | Weighted- |  | ​ |  | ​
​ | ​ | shares | ​ | Weighted- | ​ | average | ​ | Aggregate | ​
​ | ​ | underlying | ​ | average | ​ | remaining | ​ | intrinsic | ​
​ | ​ | options | ​ | exercise price | ​ | contractual | ​ | value (in | ​
​ | ​ | (in thousands) | ​ | per share |  | life (in years) | ​ | thousands) | ​
Outstanding at December 31, 2016 |  | 5,911 | ​ | $ | 12.59 | ​ | 7.3 | ​ | ​ | 129,591 |
Granted |  | 1,877 | ​ | ​ | 43.85 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (639) | ​ | ​ | 5.76 | ​ | ​ | ​ | ​ | 22,105 | ​
Canceled/forfeited/expired |  | (123) | ​ | ​ | 23.79 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2017 |  | 7,026 | ​ | $ | 21.36 | ​ | 7.3 | ​ | $ | 69,555 | ​
Granted |  | 896 | ​ | ​ | 30.83 | ​ | ​ | ​ | ​ | ​ | ​
Exercised |  | (1,304) | ​ | ​ | 14.27 | ​ | ​ | ​ | ​ | 46,639 | ​
Canceled/forfeited/expired |  | (311) | ​ | ​ | 31.14 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2018 |  | 6,307 | ​ | $ | 23.69 | ​ | 6.7 | ​ | $ | 204,896 | ​
Granted | ​ | 186 | ​ | ​ | 68.10 | ​ | ​ | ​ | ​ | ​ | ​
Replacement Awards | ​ | 803 | ​ | ​ | 13.64 | ​ | ​ | ​ | ​ | ​ | ​
Exercised | ​ | (696) | ​ | ​ | 21.53 | ​ | ​ | ​ | ​ | 33,132 | ​
Canceled/forfeited/expired | ​ | (17) | ​ | ​ | 42.75 | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2019 | ​ | 6,583 | ​ | $ | 23.91 | ​ | 6.1 | ​ | $ | 204,062 | ​
Vested and expected to vest at December 31, 2019 | ​ | 6,418 | ​ | $ | 24.16 | ​ | 6.2 | ​ | $ | 197,261 | ​
Exercisable at December 31, 2019 | ​ | 4,985 | ​ | $ | 19.71 | ​ | 5.5 | ​ | $ | 173,590 | ​
Schedule of the weighted-average assumptions used to estimate the fair value of options granted to employees | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Year ended |
​ | ​ | ​ | December 31, |
​ | ​ | ​ | 2019 | ​ | ​ | 2018 | ​ | ​ | 2017 |
Risk-free interest rate |  | ​ | 2.17 | % | ​ | 2.67 | % | ​ | 2.13 | %
Expected dividend yield |  | ​ | 0.0 | % | ​ | 0.0 | % | ​ | 0.0 | %
Expected volatility |  | ​ | 46.8 | % | ​ | 44.9 | % | ​ | 46.5 | %
Expected term (in years) |  | ​ | 6.01 | ​ | ​ | 6.10 | ​ | ​ | 6.04 | ​
Schedule summarizing restricted stock unit activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | Weighted- | ​
​ | ​ | ​ | Number of | ​ | average | ​
​ | ​ | ​ | shares | ​ | grant date | ​
​ | ​ | ​ | (in thousands) | ​ | fair value | ​
Unvested at December 31, 2017 | ​ | ​ | 173 | ​ | $ | 39.10 | ​
Granted | ​ | ​ | 419 | ​ | ​ | 33.64 | ​
Vested | ​ | ​ | (41) | ​ | ​ | 39.36 | ​
Canceled/forfeited | ​ | ​ | (19) | ​ | ​ | 33.67 | ​
Unvested at December 31, 2018 |  | ​ | 532 | ​ | $ | 35.17 | ​
Granted | ​ | ​ | 323 | ​ | ​ | 69.76 | ​
Replacement Awards | ​ | ​ | 102 | ​ | ​ | 63.07 | ​
Vested | ​ | ​ | (237) | ​ | ​ | 36.54 | ​
Canceled/forfeited | ​ | ​ | (25) | ​ | ​ | 44.59 | ​
Unvested at December 31, 2019 | ​ | ​ | 695 | ​ | $ | 54.40 | ​
Schedule summarizing cash settled stock options activity | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Number of |  | ​ |  | ​ | Weighted- |  | ​ |  | ​
​ | ​ | shares | ​ | Weighted- | ​ | average | ​ | Aggregate | ​
​ | ​ | underlying | ​ | average | ​ | remaining | ​ | intrinsic | ​
​ | ​ | options | ​ | exercise price | ​ | contractual | ​ | value (in | ​
​ | ​ | (in thousands) | ​ | per share |  | life (in years) | ​ | thousands) | ​
Outstanding at December 31, 2018 |  | — | ​ | $ | — | ​ | — | ​ | $ | — | ​
Replacement Awards | ​ | 230 | ​ | ​ | 25.89 | ​ | ​ | ​ | ​ | ​ | ​
Exercised | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | — | ​
Canceled/forfeited/expired | ​ | — | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | ​
Outstanding at December 31, 2019 | ​ | 230 | ​ | $ | 25.89 | ​ | 0.5 | ​ | $ | 6,572 | ​
Exercisable at December 31, 2019 | ​ | 230 | ​ | $ | 25.89 | ​ | 0.5 | ​ | $ | 6,572 | ​
Schedule summarizing the allocation of stock-based compensation | The following table summarizes the allocation of stock-based compensation related to stock options and RSUs and includes Replacement Awards, as well as cash-settled stock options in the accompanying consolidated statements of operations (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year ended |
​ | ​ | December 31, |
​ | ​ | 2019 | ​ | 2018 | ​ | 2017 |
​ | ​ | ​ | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Cost of sales |  | $ | 1,127 | ​ | $ | 703 |  | $ | 597 | ​
Selling, general & administrative | ​ | ​ | 31,801 | ​ |  | 19,816 | ​ |  | 13,006 | ​
Research and development | ​ | ​ | 6,553 | ​ |  | 5,185 | ​ |  | 3,989 | ​
Total |  | $ | 39,481 | ​ | $ | 25,704 | ​ | $ | 17,592 | ​
Schedule of Common stock reserved for issuance | Common stock reserved for issuance is as follows (in thousands):
​ | ​ | ​ | ​
​ |  | As of |
​ | ​ | December 31, |
​ | ​ | 2019 |
​ | ​ | ​ | ​
Stock options issued and outstanding—2001 Plan | ​ | 413 | ​
Stock options issued and outstanding—2011 Plan | ​ | 1,384 | ​
Stock options issued and outstanding—2015 Plan | ​ | 4,786 | ​
Employee stock purchase plan | ​ | 1,341 | ​
Authorized for future stock awards or option grants | ​ | 5,405 | ​
​ | ​ | 13,329 | ​

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