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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Stockholders' Equity [Abstract] |
Summary of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ |  | Stock Options Outstanding
﻿ |  | Number |  |  |  |  | Weighted average
﻿ |  | of shares |  | Exercise price |  | exercise price
﻿Balances, December 31, 2018 |  | 25,176 |  | $ | 1.16 – 16.00 |  | $ | 5.66
﻿Additional shares reserved |  |  |  |  |  |  |  |
﻿Options granted |  | — |  |  | — |  |  | —
﻿Options exercised |  | (1,199) |  | $ | 1.16 – 7.05 |  | $ | 4.78
﻿Options canceled |  | (1,280) |  | $ | 2.54 – 16.00 |  | $ | 8.01
﻿Balances, December 31, 2019 |  | 22,697 |  | $ | 1.16 – 16.00 |  | $ | 5.57
﻿
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 | 414,207 |  | 2.87 |  | $ | 1.18 |  | 414,207 |  | $ | 1.18
﻿ | $ | 1.60 – 3.20 | 5,720,080 |  | 6.38 |  | $ | 2.54 |  | 3,680,040 |  | $ | 2.54
﻿ | $ | 3.20 – 4.80 | 3,110,896 |  | 3.88 |  | $ | 4.02 |  | 2,858,193 |  | $ | 4.02
﻿ | $ | 4.80 – 6.40 | 5,935,013 |  | 6.12 |  | $ | 5.46 |  | 4,895,635 |  | $ | 5.46
﻿ | $ | 6.40 – 8.00 | 2,554,434 |  | 5.19 |  | $ | 7.21 |  | 2,525,441 |  | $ | 7.21
﻿ | $ | 8.00 – 9.60 | 3,061,742 |  | 4.63 |  | $ | 8.77 |  | 2,938,483 |  | $ | 8.77
﻿ | $ | 9.60 – 11.20 | 1,224,700 |  | 4.94 |  | $ | 10.20 |  | 1,224,700 |  | $ | 10.20
﻿ | $ | 11.20 – 12.80 | 423,252 |  | 1.08 |  | $ | 12.10 |  | 423,252 |  | $ | 12.10
﻿ | $ | 12.80 – 14.40 | 163,250 |  | 1.00 |  | $ | 13.71 |  | 163,210 |  | $ | 13.71
﻿ | $ | 14.40 – 16.00 | 89,000 |  | 0.80 |  | $ | 15.99 |  | 89,000 |  | $ | 15.99
﻿ |  |  | 22,696,574 |  | 5.30 |  | $ | 5.57 |  | 19,212,161 |  | $ | 5.90
﻿ |  |  |  |  |  |  |  |  |  |  |  |  |
﻿
Summary of Time-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿RSUs outstanding at December 31, 2018 | 371 |  | $ | 3.20
﻿RSUs granted | 900 |  |  | 7.06
﻿RSUs vested | (127) |  |  | 4.35
﻿RSUs forfeited | (58) |  |  | 5.86
﻿Unvested RSUs outstanding at December 31, 2019 | 1,086 |  | $ | 6.12
﻿
Summary of Performance-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿PSUs outstanding at December 31, 2018 | 586 |  | $ | 2.58
﻿PSUs granted | — |  |  | —
﻿PSUs vested | (204) |  |  | 2.57
﻿PSUs forfeited | (244) |  |  | 2.57
﻿Unvested PSUs outstanding at December 31, 2019 | 138 |  | $ | 2.63
﻿
Schedule of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2019 |  | 2018 |  | 2017
﻿Cost of revenue | $ | 1,857 |  | $ | 3,124 |  | $ | 2,311
﻿Research and development |  | 7,699 |  |  | 10,076 |  |  | 8,506
﻿Sales, general and administrative |  | 6,845 |  |  | 9,953 |  |  | 9,535
﻿Total stock-based compensation expense | $ | 16,401 |  | $ | 23,153 |  | $ | 20,352
﻿
Schedule of Fair Value of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2019 |  | 2018 |  | 2017
﻿Expected term (years) |  |  | — |  |  | 5.2 years |  |  | 6.1 years
﻿Expected volatility |  |  | — |  |  | 66.8% |  |  | 70.0%
﻿Risk-free interest rate |  |  | — |  |  | 2.6% |  |  | 2.1%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿ |  |  |  |  |  |  |  |  |
﻿
Schedule of Fair Value of Employee Stock Purchase Plan |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2019 |  | 2018 |  | 2017
﻿Expected term (years) |  |  | — |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0
﻿Expected volatility |  |  | — |  |  | 65% - 67% |  |  | 70.0%
﻿Risk-free interest rate |  |  | — |  |  | 1.3%-2.7% |  |  | 0.8%-1.4%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿

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