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Employee Benefit Plans and Stock-based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Company's Stock Option and Restricted Stock Unit Activity |
|  |  | Stock Options Outstanding |  | RSUs Outstanding*
| Shares Available for Grant |  | Number of Shares |  | Weighted Average Exercise Price |  | Number of Units |  | Weighted Average Grant Date Fair Value
Balance at December 31, 2016 | 3,912 |  |  | 5,019 |  |  | $ | 6.01 |  |  | 3,864 |  |  | $ | 4.26 |
Authorized | — |  |  | — |  |  | — |  |  | — |  |  | — |
Granted | (3,181 | ) |  | 30 |  |  | 5.10 |  |  | 2,100 |  |  | 5.49 |
Options exercised | — |  |  | (81 | ) |  | 3.00 |  |  | — |  |  | — |
Shares released | — |  |  | — |  |  | — |  |  | (1,672 | ) |  | 3.93 |
Forfeited | 748 |  |  | (287 | ) |  | 6.41 |  |  | (308 | ) |  | 4.24 |
Balance at March 31, 2017 | 1,479 |  |  | 4,681 |  |  | $ | 6.04 |  |  | 3,984 |  |  | $ | 5.05 |
Summary of Stock Options Outstanding | The following table summarizes information about stock options outstanding as of March 31, 2017 (in thousands, except per share amounts and terms):
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Vested and expected to vest | 4,681 |  |  | $ | 6.04 |  |  | 3.9 |  | $ | 3,200 |
Exercisable | 3,350 |  |  | 6.38 |  |  | 3.2 |  | 1,446 |
Summary of Restricted Stock Units Outstanding | The following table summarizes information about RSUs and PRSUs outstanding as of March 31, 2017 (in thousands, except term):
| Number of Shares Underlying Restricted Stock Units |  | Weighted Average Remaining Vesting Period (Years) |  | Aggregate Fair Value
Vested and expected to vest | 3,573 |  |  | 1.1 |  | $ | 21,260 |
Schedule of Defined Benefit Plans Obligations | The table below shows the components of net periodic benefit costs (in thousands):
| Three months ended
| March 31, 2017 |  | April 1, 2016
Service cost | $ | 55 |  |  | $ | 23 |
Interest cost | 16 |  |  | 10 |
Recognized net actuarial loss | 1 |  |  | — |
Net periodic benefit cost included in operating loss | $ | 72 |  |  | $ | 33 |
Summary of Stock-Based Compensation Expense | Stock-based Compensation The following table summarizes stock-based compensation expense for all plans (in thousands):
| Three months ended
| March 31, 2017 |  | April 1, 2016
Stock-based compensation in: |  |  |
Cost of revenue | $ | 445 |  |  | $ | 227 |
Research and development expense | 977 |  |  | 969 |
Selling, general and administrative expense | 1,829 |  |  | 1,898 |
Total stock-based compensation in operating expense | 2,806 |  |  | 2,867 |
Total stock-based compensation | $ | 3,251 |  |  | $ | 3,094 |
Valuation Assumptions for Stock Options |
| Employee Stock Options
| Three months ended
| March 31, 2017 |  | April 1, 2016
Expected term (years) | 4.30 |  |  | 4.30 |
Volatility | 42 | % |  | 36 | %
Risk-free interest rate | 1.8 | % |  | 1.4 | %
Expected dividends | 0.0 | % |  | 0.0 | %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions |
| ESPP Purchase Period Ending
| July 3, 2017 |  | June 30, 2016
Expected term (years) | 0.50 |  |  | 0.5 |
Volatility | 63 | % |  | 52 | %
Risk-free interest rate | 0.8 | % |  | 0.5 | %
Expected dividends | 0.0 | % |  | 0.0 | %
Estimated weighted average fair value per share at purchase date | $1.71 |  | $1.17

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2439-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e2410-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=73719040&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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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=6415400&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=6415400&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 of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value. + References No definition available. + Details
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- 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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired 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=6415400&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 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=6415400&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=6415400&loc=d3e5070-113901 + Details
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