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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 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 | — |  | (801) |  |  | 1.16 – 7.05 |  |  | 4.84
﻿Options canceled | 542 |  | (542) |  |  | 2.54 – 16.0 | 0 |  | 10.27
﻿Balances, March 31, 2019 | 20,333 |  | 23,833 |  | $ | 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 | 815 |  |  | 7.18
﻿RSUs released | (78) |  |  | 2.58
﻿RSUs forfeited | (6) |  |  | 7.16
﻿Unvested RSUs outstanding at March 31, 2019 | 1,102 |  | $ | 6.17
﻿
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 March 31, 2019 | 138 |  | $ | 2.63
﻿
Schedule of Stock-Based Compensation Expense |
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﻿ |  |  |  |  |  |
﻿ | Three Months Ended March 31, |
﻿ | 2019 |  | 2018 |
﻿Cost of revenue | $ | 512 |  | $ | 664 |
﻿Research and development |  | 2,012 |  |  | 2,222 |
﻿Sales, general and administrative |  | 1,857 |  |  | 2,396 |
﻿Total stock-based compensation expense | $ | 4,381 |  | $ | 5,282 |
﻿
Schedule of Fair Value of Employee Stock Options |
﻿ |  |  |  |
﻿ |  |  |  |
﻿ | Three Months Ended March 31, |
﻿Stock Option | 2019 |  | 2018 |
﻿Expected term in years | — |  | 5.2 |
﻿Expected volatility | — |  | 67% |
﻿Risk-free interest rate | — |  | 2.5% |
﻿Dividend yield | — |  | — |
﻿ |  |  |  |
﻿
Schedule of Fair Value of Employee Stock Purchase Plan |
﻿ |  |  |
﻿ |  |  |
﻿ | Three Months Ended March 31,
﻿ESPP | 2019 |  | 2018
﻿Expected term in years | — |  | 0.5-2.0
﻿Expected volatility | — |  | 67%
﻿Risk-free interest rate | — |  | 1.9%-2.2%
﻿Dividend yield | — |  | —
﻿

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