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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2016
Stockholders' Equity [Line Items] |
Summary Of Stock Option Activity |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | Stock Options Outstanding
﻿ | Shares available |  | Number |  |  |  |  | Weighted average
﻿ | for grant |  | of shares |  | Exercise price |  | exercise price
﻿Balances, December 31, 2015 | 5,814 |  | 19,468 |  | $ | 0.70 – 16.00 |  | $ | 5.69
﻿Additional shares reserved | 4,799 |  |  |  |  |  |  |  |
﻿Options granted | (4,228) |  | 4,228 |  | $ | 3.89 – 12.85 |  | $ | 8.68
﻿Options exercised | — |  | (745) |  | $ | 0.70 – 8.90 |  | $ | 3.37
﻿Options canceled | 450 |  | (450) |  | $ | 1.16 – 16.00 |  | $ | 7.29
﻿Balances, December 31, 2016 | 6,835 |  | 22,501 |  | $ | 1.16 – 16.00 |  | $ | 6.30
﻿
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 |  | 711,212 |  | 5.85 |  | $ | 1.18 |  | 573,528 |  | $ | 1.18
﻿$ | 1.60 – 3.20 |  | 3,551,871 |  | 5.15 |  | $ | 2.43 |  | 3,140,084 |  | $ | 2.46
﻿$ | 3.20 – 4.80 |  | 3,939,254 |  | 5.65 |  | $ | 4.12 |  | 3,553,978 |  | $ | 4.10
﻿$ | 4.80 – 6.40 |  | 3,326,312 |  | 7.12 |  | $ | 5.66 |  | 2,011,713 |  | $ | 5.67
﻿$ | 6.40 – 8.00 |  | 3,818,451 |  | 7.35 |  | $ | 7.14 |  | 2,012,847 |  | $ | 7.03
﻿$ | 8.00 – 9.60 |  | 4,438,277 |  | 7.74 |  | $ | 8.78 |  | 1,727,277 |  | $ | 8.66
﻿$ | 9.60 – 11.20 |  | 1,590,991 |  | 8.12 |  | $ | 10.18 |  | 585,398 |  | $ | 10.37
﻿$ | 11.20 – 12.80 |  | 607,902 |  | 4.06 |  | $ | 12.11 |  | 607,902 |  | $ | 12.11
﻿$ | 12.80 – 14.40 |  | 385,500 |  | 4.03 |  | $ | 13.87 |  | 383,600 |  | $ | 13.87
﻿$ | 14.40 – 16.00 |  | 131,500 |  | 3.86 |  | $ | 15.99 |  | 131,500 |  | $ | 15.99
﻿ |  |  | 22,501,270 |  | 6.59 |  | $ | 6.30 |  | 14,727,827 |  | $ | 5.73
﻿
Schedule Of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2016 |  | 2015 |  | 2014
﻿Cost of revenue | $ | 2,133 |  | $ | 1,313 |  | $ | 758
﻿Research and development |  | 8,257 |  |  | 5,196 |  |  | 3,785
﻿Sales, general and administrative |  | 9,172 |  |  | 7,331 |  |  | 5,400
﻿Total stock-based compensation expense | $ | 19,562 |  | $ | 13,840 |  | $ | 9,943
﻿
Stock Options [Member] |
Stockholders' Equity [Line Items] |
Schedule Of Fair Value Of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2016 |  | 2015 |  | 2014
﻿Expected term (years) |  |  | 6.1 years |  |  | 6.1 years |  |  | 6.1 years
﻿Expected volatility |  |  | 70.0% |  |  | 70.0% |  |  | 70.0%
﻿Risk-free interest rate |  |  | 1.5% |  |  | 1.7% |  |  | 1.9%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿ |  |  |  |  |  |  |  |  |
﻿
ESPP [Member] |
Stockholders' Equity [Line Items] |
Schedule Of Fair Value Of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2016 |  | 2015 |  | 2014
﻿Expected term (years) |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0 |  |  | 0.5 - 2.0
﻿Expected volatility |  |  | 70.0% |  |  | 70.0% |  |  | 70.0%
﻿Risk-free interest rate |  |  | 0.5%-0.9% |  |  | 0.1%-0.7% |  |  | 0.1%-0.5%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿

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