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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2016 | 6,471 |  | 22,501 |  | $ | 1.16 – 16.00 |  | $ | 6.30
﻿Additional shares reserved | 4,634 |  |  |  |  |  |  |  |
﻿Options granted | (6,239) |  | 6,239 |  | $ | 2.66 – 5.37 |  | $ | 4.84
﻿Options exercised | — |  | (1,407) |  | $ | 1.16 – 5.27 |  | $ | 2.55
﻿Options canceled | 1,929 |  | (1,929) |  | $ | 1.16 – 16.00 |  | $ | 7.00
﻿Balances, December 31, 2017 | 6,795 |  | 25,404 |  | $ | 1.16 – 16.00 |  | $ | 6.10
﻿
Reconciliation Of Outstanding And Exercisable Stock Options |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Options Outstanding |  | Options Exercisable
﻿ |  |  | Weighted average |  |  |  |  |  |  |  |
﻿ | Number |  | remaining contractual |  | Weighted average |  | Number |  | Weighted average
﻿ | outstanding |  | life (Years) |  | exercise price |  | vested |  | exercise price
﻿ | 25,404,152 |  | 6.51 |  | $ | 6.10 |  | 16,802,740 |  | $ | 6.05
﻿
Schedule Of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |
﻿ | Years Ended December 31,
﻿ | 2017 |  | 2016 |  | 2015
﻿Cost of revenue | $ | 2,311 |  | $ | 2,133 |  | $ | 1,313
﻿Research and development |  | 8,506 |  |  | 8,257 |  |  | 5,196
﻿Sales, general and administrative |  | 9,535 |  |  | 9,172 |  |  | 7,331
﻿Total stock-based compensation expense | $ | 20,352 |  | $ | 19,562 |  | $ | 13,840
﻿
Stock Options [Member] |
Stockholders' Equity [Line Items] |
Schedule Of Fair Value Of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿Expected term (years) |  |  | 6.1 years |  |  | 6.1 years |  |  | 6.1 years
﻿Expected volatility |  |  | 70.0% |  |  | 70.0% |  |  | 70.0%
﻿Risk-free interest rate |  |  | 2.1% |  |  | 1.5% |  |  | 1.7%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿ |  |  |  |  |  |  |  |  |
﻿
ESPP [Member] |
Stockholders' Equity [Line Items] |
Schedule Of Fair Value Of Employee Stock Options |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |
﻿ |  | Years Ended December 31,
﻿ |  | 2017 |  | 2016 |  | 2015
﻿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 |  |  | 0.8%-1.4% |  |  | 0.5%-0.9% |  |  | 0.1%-0.7%
﻿Dividend yield |  |  | — |  |  | — |  |  | —
﻿

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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