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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Stockholders' Equity [Abstract] |
Summary of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | Stock Options Outstanding
﻿ | Shares available |  | Number |  |  |  |  | Weighted average
﻿ | for grant |  | of shares |  | Exercise price |  | exercise price
﻿Balances, December 31, 2017 | 6,795 |  | 25,404 |  | $ | 1.16 – 16.00 |  | $ | 6.10
﻿Additional shares reserved | 6,976 |  |  |  |  |  |  |  |
﻿Options granted | (4,204) |  | 4,204 |  | $ | 2.47 – 4.28 |  | $ | 2.57
﻿Options exercised | — |  | (1,720) |  | $ | 1.16 – 7.05 |  | $ | 3.73
﻿Options canceled | 2,712 |  | (2,712) |  | $ | 1.16 – 16.00 |  | $ | 6.19
﻿Balances, December 31, 2018 | 12,279 |  | 25,176 |  | $ | 1.16 – 16.00 |  | $ | 5.66
﻿
Reconciliation of Outstanding and Exercisable Stock Options |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  | Options Outstanding |  | Options Exercisable
﻿ |  |  |  |  | Weighted average |  |  |  |  |  |  |  |
﻿ |  |  | Number |  | remaining contractual |  | Weighted average |  | Number |  | Weighted average
﻿ | Exercise price | outstanding |  | life (Years) |  | exercise price |  | vested |  | exercise price
﻿ | $ | 0.00 – 1.60 | 438,233 |  | 3.84 |  | $ | 1.18 |  | 438,233 |  | $ | 1.18
﻿ | $ | 1.60 – 3.20 | 6,141,372 |  | 7.30 |  | $ | 2.53 |  | 2,877,885 |  | $ | 2.47
﻿ | $ | 3.20 – 4.80 | 3,587,706 |  | 4.63 |  | $ | 4.07 |  | 3,064,649 |  | $ | 4.10
﻿ | $ | 4.80 – 6.40 | 6,390,401 |  | 6.98 |  | $ | 5.45 |  | 4,258,318 |  | $ | 5.53
﻿ | $ | 6.40 – 8.00 | 2,868,379 |  | 5.74 |  | $ | 7.19 |  | 2,604,086 |  | $ | 7.14
﻿ | $ | 8.00 – 9.60 | 3,560,966 |  | 5.24 |  | $ | 8.77 |  | 2,853,592 |  | $ | 8.76
﻿ | $ | 9.60 – 11.20 | 1,293,448 |  | 5.82 |  | $ | 10.20 |  | 1,035,715 |  | $ | 10.23
﻿ | $ | 11.20 – 12.80 | 449,502 |  | 2.00 |  | $ | 12.13 |  | 449,502 |  | $ | 12.13
﻿ | $ | 12.80 – 14.40 | 323,250 |  | 1.08 |  | $ | 13.94 |  | 3,227,035 |  | $ | 13.94
﻿ | $ | 14.40 – 16.00 | 122,750 |  | 1.49 |  | $ | 15.99 |  | 122,750 |  | $ | 15.99
﻿ |  |  | 25,176,007 |  | 6.03 |  | $ | 5.66 |  | 18,027,465 |  | $ | 6.09
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿
Summary of Time-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿RSUs outstanding at December 31, 2017 | — |  | $ | —
﻿RSUs granted | 413 |  |  | 3.14
﻿RSUs released | — |  |  | —
﻿RSUs forfeited | (42) |  |  | 2.54
﻿Unvested RSUs outstanding at December 31, 2018 | 371 |  | $ | 3.20
﻿
Summary of Performance-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿PSUs outstanding at December 31, 2017 | — |  | $ | —
﻿PSUs granted | 657 |  |  | 2.58
﻿PSUs released | — |  |  | —
﻿PSUs forfeited | (71) |  |  | 2.54
﻿Unvested PSUs outstanding at December 31, 2018 | 586 |  | $ | 2.58
﻿
Schedule of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2018 |  | 2017 |  | 2016
﻿Cost of revenue | $ | 3,124 |  | $ | 2,311 |  | $ | 2,133
﻿Research and development |  | 10,076 |  |  | 8,506 |  |  | 8,257
﻿Sales, general and administrative |  | 9,953 |  |  | 9,535 |  |  | 9,172
﻿Total stock-based compensation expense | $ | 23,153 |  | $ | 20,352 |  | $ | 19,562
﻿
Schedule of Fair Value of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿Expected term (years) |  |  | 5.2 years |  |  | 6.1 years |  |  | 6.1 years
﻿Expected volatility |  |  | 66.8% |  |  | 70.0% |  |  | 70.0%
﻿Risk-free interest rate |  |  | 2.6% |  |  | 2.1% |  |  | 1.5%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
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﻿
Schedule of Fair Value of Employee Stock Purchase Plan |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2018 |  | 2017 |  | 2016
﻿Expected term (years) |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0
﻿Expected volatility |  |  | 65% - 67% |  |  | 70.0% |  |  | 70.0%
﻿Risk-free interest rate |  |  | 1.3%-2.7% |  |  | 0.8%-1.4% |  |  | 0.5%-0.9%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿

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