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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019
Stockholders' Equity [Abstract] |
Summary of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | Stock Options Outstanding
﻿ |  |  |  |  |  |  |  | Weighted
﻿ | Shares available |  | Number |  |  |  |  | average
﻿ | for grant |  | of shares |  | Exercise price |  | exercise price
﻿Balances, December 31, 2018 | 12,279 |  | 25,176 |  | $ | 1.16 – 16.00 |  | $ | 5.66
﻿Additional shares reserved | 7,512 |  |  |  |  |  |  |  |
﻿Options granted | — |  | — |  |  | — |  |  | —
﻿Options exercised | — |  | (1,086) |  |  | 1.16 – 7.05 |  |  | 4.86
﻿Options canceled | 676 |  | (676) |  |  | 2.54 – 16.00 |  |  | 9.65
﻿Balances, June 30, 2019 | 20,467 |  | 23,414 |  | $ | 1.16 – 16.00 |  | $ | 5.58
﻿
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 | 843 |  |  | 7.18
﻿RSUs released | (81) |  |  | 2.58
﻿RSUs forfeited | (12) |  |  | 6.48
﻿Unvested RSUs outstanding at June 30, 2019 | 1,121 |  | $ | 6.20
﻿
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 released | (204) |  |  | 2.57
﻿PSUs forfeited | (244) |  |  | 2.57
﻿Unvested PSUs outstanding at June 30, 2019 | 138 |  | $ | 2.63
﻿
Schedule of Stock-Based Compensation Expense |
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﻿ | Three Months Ended June 30, |  | Six Months Ended June 30, |
﻿ | 2019 |  | 2018 |  | 2019 |  | 2018 |
﻿Cost of revenue | $ | 444 |  | $ | 633 |  | $ | 956 |  | $ | 1,297 |
﻿Research and development |  | 1,918 |  |  | 2,229 |  |  | 3,930 |  |  | 4,451 |
﻿Sales, general and administrative |  | 1,727 |  |  | 2,362 |  |  | 3,584 |  |  | 4,758 |
﻿Total stock-based compensation expense | $ | 4,089 |  | $ | 5,224 |  | $ | 8,470 |  | $ | 10,506 |
﻿
Schedule of Fair Value of Employee Stock Options |
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﻿ | Three Months Ended June 30, |  | Six Months Ended June 30, |
﻿Stock Option | 2019 |  | 2018 |  | 2019 |  | 2018 |
﻿Expected term in years | — |  | 5.2 |  | — |  | 5.2 |
﻿Expected volatility | — |  | 65% |  | — |  | 67% |
﻿Risk-free interest rate | — |  | 2.8% |  | — |  | 2.5% |
﻿Dividend yield | — |  | — |  | — |  | — |
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﻿
Schedule of Fair Value of Employee Stock Purchase Plan |
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﻿ |  |  |  |  |  |  |
﻿ | Three Months Ended June 30, |  | Six Months Ended June 30,
﻿ESPP | 2019 |  | 2018 |  | 2019 |  | 2018
﻿Expected term in years | — |  | 0.5-2.0 |  | — |  | 0.5-2.0
﻿Expected volatility | — |  | 67% |  | — |  | 67%
﻿Risk-free interest rate | — |  | 1.9%-2.2% |  | — |  | 1.9%-2.2%
﻿Dividend yield | — |  | — |  | — |  | —
﻿

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