XML 31 R20.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Stockholders' Equity (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2018
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, 2017 | 6,795 |  | 25,404 |  | $ | 1.16 – 16.00 |  | $ | 6.10
﻿Additional shares reserved | 6,976 |  |  |  |  |  |  |  |
﻿Options granted | (4,141) |  | 4,141 |  |  | 2.47 – 3.40 |  |  | 2.55
﻿Options exercised | — |  | (123) |  |  | 1.16 – 2.54 |  |  | 2.29
﻿Options canceled | 821 |  | (821) |  |  | 1.16 – 16.0 |  |  | 5.63
﻿Balances, June 30, 2018 | 10,451 |  | 28,601 |  | $ | 1.16 – 16.00 |  | $ | 5.61
﻿
Summary of Time-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿RSUs outstanding at December 31, 2017 | — |  | $ | —
﻿RSUs granted | 365 |  |  | 2.57
﻿RSUs released | — |  |  | —
﻿RSUs forfeited | (10) |  |  | 2.54
﻿Unvested RSUs outstanding at June 30, 2018 | 355 |  | $ | 2.57
﻿
Summary of Performance-Based RSUs Activity |
﻿ |  |  |  |
﻿ |  |  | Weighted average
﻿ | Number |  | grant date
﻿ | of shares |  | fair value
﻿PSUs outstanding at December 31, 2017 | — |  | $ | —
﻿PSUs granted | 657 |  |  | 2.58
﻿PSUs released | — |  |  | —
﻿PSUs forfeited | (5) |  |  | 2.54
﻿Unvested PSUs outstanding at June 30, 2018 | 652 |  | $ | 2.58
﻿
Schedule of Stock-Based Compensation Expense |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |  |  |  |  |
﻿ | Three-Month Periods Ended June 30, |  | Six-Month Periods Ended June 30,
﻿ | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Cost of revenue | $ | 633 |  | $ | 572 |  | $ | 1,297 |  | $ | 1,095
﻿Research and development |  | 2,229 |  |  | 2,029 |  |  | 4,451 |  |  | 4,060
﻿Sales, general and administrative |  | 2,362 |  |  | 2,408 |  |  | 4,758 |  |  | 4,839
﻿Total stock-based compensation expense | $ | 5,224 |  | $ | 5,009 |  | $ | 10,506 |  | $ | 9,994
﻿
Schedule of Fair Value of Employee Stock Options |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿ | Three-Month Periods Ended June 30, |  | Six-Month Periods Ended June 30,
﻿Stock Option | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Expected term in years | 5.2 |  | 6.1 |  | 5.2 |  | 6.1
﻿Expected volatility | 65% |  | 70% |  | 67% |  | 70%
﻿Risk-free interest rate | 2.8% |  | 1.9% |  | 2.5% |  | 2.1%
﻿Dividend yield | — |  | — |  | — |  | —
﻿ |  |  |  |  |  |  |
﻿
Schedule of Fair Value of Employee Stock Purchase Plan |
﻿ |  |  |  |  |  |  |
﻿ |  |  |  |  |  |  |
﻿ | Three-Month Periods Ended June 30, |  | Six-Month Periods Ended June 30,
﻿ESPP | 2018 |  | 2017 |  | 2018 |  | 2017
﻿Expected term in years | 0.5-2.0 |  | 0.5-2.0 |  | 0.5-2.0 |  | 0.5-2.0
﻿Expected volatility | 67% |  | 70% |  | 67% |  | 70%
﻿Risk-free interest rate | 1.9%-2.2% |  | 0.8%-1.3% |  | 1.9%-2.2% |  | 0.8%-1.3%
﻿Dividend yield | — |  | — |  | — |  | —
﻿

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfEmployeeServiceShareBasedCompensationAllocationOfRecognizedPeriodCostsTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ScheduleOfShareBasedCompensationRestrictedStockUnitsAwardActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedCompensationStockOptionsActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of employee stock purchase plans, including, but not limited to: (a) expected term, (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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- 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
Name: | us-gaap_ScheduleOfShareBasedPaymentAwardStockOptionsValuationAssumptionsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of number and weighted-average grant date fair value for nonvested performance shares. + 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 (c) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
Name: | us-gaap_ShareBasedCompensationPerformanceSharesAwardUnvestedActivityTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration