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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
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 (in thousands):
|  | 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, 2015 |  | 5,701 |  | $ | 7.10 |  | 6.7 |  | $ | 102,390 |
Granted |  | 1,979 |  |  | 21.24 |  |  |  |  |  |
Exercised |  | (1,660) |  |  | 3.65 |  |  |  |  | 42,458 |
Canceled/forfeited/expired |  | (109) |  |  | 20.00 |  |  |  |  |  |
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 |
Vested and expected to vest at December 31, 2018 |  | 6,213 |  | $ | 23.53 |  | 6.7 |  | $ | 202,779 |
Exercisable at December 31, 2018 |  | 3,929 |  | $ | 17.54 |  | 5.8 |  | $ | 151,798 |
Schedule summarizing restricted stock unit activity | Restricted Stock Units The following table summarizes the activity of unvested restricted stock units under the Stock Plans during the years ended December 31, 2018 and December 31, 2017:
|  |  |  |  | Weighted- |
|  |  | Number of |  | average |
|  |  | shares |  | grant date |
|  |  | (in thousands) |  | fair value |
Unvested at December 31, 2016 |  |  | — |  | $ | — |
Granted |  |  | 173 |  |  | 39.10 |
Vested |  |  | — |  |  | — |
Canceled/forfeited |  |  | — |  |  | — |
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 |
Schedule summarizing the allocation of stock-based compensation |
|  | Year ended |
|  | December 31, |
|  | 2018 |  | 2017 |  | 2016 |
Cost of sales |  | $ | 703 |  | $ | 597 |  | $ | 233 |
Selling, general & administrative |  |  | 19,816 |  |  | 13,006 |  |  | 6,475 |
Research and development |  |  | 5,185 |  |  | 3,989 |  |  | 2,078 |
Total |  | $ | 25,704 |  | $ | 17,592 |  | $ | 8,786 |
Schedule of the weighted-average assumptions used to estimate the fair value of options granted to employees |
|  |  | Year ended |
|  |  | December 31, |
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
Risk-free interest rate |  |  | 2.67 | % |  | 2.13 | % |  | 1.59 | %
Expected dividend yield |  |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Expected volatility |  |  | 44.9 | % |  | 46.5 | % |  | 52.9 | %
Expected term (in years) |  |  | 6.10 |  |  | 6.04 |  |  | 6.04 |
Schedule of Common stock reserved for issuance | Common stock reserved for issuance is as follows (in thousands):
|  | As of |
|  | December 31, |
|  | 2018 |
Stock options issued and outstanding—2001 Plan |  | 510 |
Stock options issued and outstanding—2011 Plan |  | 1,540 |
Stock options issued and outstanding—2015 Plan |  | 4,789 |
Employee stock purchase plan |  | 1,062 |
Authorized for future stock awards or option grants |  | 4,226 |
|  | 12,127 |

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