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Stockholders' Equity (Tables) | 9 Months Ended
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Sep. 30, 2017
Stockholders' Equity [Abstract] |
Summary Of Stock Option Activity |
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﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  | Stock Options Outstanding
﻿ |  |  |  |  |  |  |  | Weighted
﻿ | Shares available |  | Number |  |  |  |  | average
﻿ | for grant |  | of shares |  | Exercise price |  | exercise price
﻿Balances, December 31, 2016 | 6,835 |  | 22,501 |  | $ | 1.16 – 16.00 |  | $ | 6.30
﻿Additional shares reserved | 4,634 |  |  |  |  |  |  |  |
﻿Options granted | (5,600) |  | 5,600 |  |  | 3.30 – 5.37 |  |  | 5.05
﻿Options exercised | — |  | (1,369) |  |  | 1.16 – 5.27 |  |  | 2.55
﻿Options canceled | 1,599 |  | (1,599) |  |  | 1.16 – 16.0 |  |  | 7.08
﻿Balances, September 30, 2017 | 7,468 |  | 25,133 |  | $ | 1.16 – 16.0 |  | $ | 6.18
﻿
Schedule Of Stock-Based Compensation Expense |
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﻿ | Three-Month Periods Ended September 30, |  | Nine-Month Periods Ended September 30, |
﻿ | 2017 |  | 2016 |  | 2017 |  | 2016 |
﻿Cost of revenue | $ | 608 |  | $ | 549 |  | $ | 1,703 |  | $ | 1,610 |
﻿Research and development |  | 2,071 |  |  | 2,141 |  |  | 6,131 |  |  | 6,182 |
﻿Sales, general and administrative |  | 2,289 |  |  | 2,417 |  |  | 7,128 |  |  | 6,934 |
﻿Total stock-based compensation expense | $ | 4,968 |  | $ | 5,107 |  | $ | 14,962 |  | $ | 14,726 |
﻿
Schedule Of Fair Value Of Employee Stock Options |
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﻿ | Three-Month Periods Ended September 30, |  | Nine-Month Periods Ended September 30, |  |
﻿Stock Option | 2017 |  | 2016 |  | 2017 |  | 2016 |  |
﻿Expected term in years | 6.1 |  | 6.1 |  | 6.1 |  | 6.1 |  |
﻿Expected volatility | 70% |  | 70% |  | 70% |  | 70% |  |
﻿Risk-free interest rate | 1.9% |  | 1.3% |  | 2.1% |  | 1.5% |  |
﻿Dividend yield | — |  | — |  | — |  | — |  |
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﻿
Schedule Of Fair Value Of Employee Stock Purchase Plan |
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﻿ | Three-Month Periods Ended September 30, |  | Nine-Month Periods Ended September 30, |
﻿ESPP | 2017 |  | 2016 |  | 2017 |  | 2016 |
﻿Expected term in years | 0.5-2.0 |  | 0.5-2.0 |  | 0.5-2.0 |  | 0.5-2.0 |
﻿Expected volatility | 70% |  | 70% |  | 70% |  | 70% |
﻿Risk-free interest rate | 1.1%-1.4% |  | 0.5%-0.8% |  | 0.8%-1.4% |  | 0.5%-0.9% |
﻿Dividend yield | — |  | — |  | — |  | — |
﻿

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