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Employee Benefit Plans and Stock-based Compensation (Tables) | 9 Months Ended
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Sep. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Summary of Company's Stock Option and Restricted Stock Unit Activity | The following table summarizes the Company’s stock option, RSU and PSU activities during the nine months ended September 30, 2016 (in thousands, except per share amounts):
|  |  | Stock Options Outstanding |  | Restricted Stock Units 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, 2015 | 6,150 |  |  | 5,674 |  |  | $ | 6.56 |  |  | 2,182 |  |  | $ | 6.99 |
Authorized | 2,000 |  |  | — |  |  | — |  |  | — |  |  | — |
Granted | (5,046 | ) |  | 916 |  |  | 3.14 |  |  | 3,053 |  |  | 3.55 |
Options exercised | — |  |  | (148 | ) |  | 4.80 |  |  | — |  |  | — |
Shares released | — |  |  | — |  |  | — |  |  | (1,269 | ) |  | 6.82 |
Forfeited or cancelled | 1,833 |  |  | (1,388 | ) |  | 6.44 |  |  | (304 | ) |  | 5.73 |
Balance at September 30, 2016 | 4,937 |  |  | 5,054 |  |  | $ | 6.03 |  |  | 3,662 |  |  | $ | 4.18 |
Summary of Stock Options Outstanding | The following table summarizes information about stock options outstanding as of September 30, 2016 (in thousands, except per share amounts):
| Number of Shares |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Vested and expected to vest | 4,826 |  |  | $ | 6.08 |  |  | 4.0 |  | $ | 3,015 |
Exercisable | 3,063 |  |  | 6.63 |  |  | 3.0 |  | 750 |
Summary of Restricted Stock Units Outstanding | The following table summarizes information about RSUs and PSUs outstanding as of September 30, 2016 (in thousands, except per share amounts):
| Number of Shares Underlying Restricted Stock Units |  | Weighted Average Remaining Vesting Period (Years) |  | Aggregate Fair Value
Vested and expected to vest | 2,740 |  |  | 0.9 |  | $ | 16,250 |
Schedule of Defined Benefit Plans Obligations | hanges to the Company’s defined benefit pension plan obligations are shown below (in thousands):
| September 30, 2016
Projected benefit obligation: |
Acquired from TVN acquisition | $ | 5,907 |
Service cost | 164 |
Interest cost | 68 |
Foreign currency translation adjustment | 102 |
As of September 30, 2016 | $ | 6,241 |
Presented on the Condensed Consolidated Balance Sheets under: |
Current portion (presented under “Accrued liabilities”) | $ | 248 |
Long-term portion (presented under “Other non-current liabilities”) | $ | 5,993 |
Schedule of Assumptions Used - Employee Benefit Plans Obligation | The following assumptions were used in determining the Company’s pension obligation:
| September 30, 2016
Discount rate | 2.0 | %
Mobility rate | 2.2 | %
Salary progression rate | 2.0 | %
Schedule of Expected Benefit Payments | Future benefits expected to be paid in each of the next five years, and in the aggregate for the five year period thereafter are as follows (in thousands):
Years ending December 31, |
2016 (remaining three months) | $ | 24 |
2017 | 117 |
2018 | 227 |
2019 | 366 |
2020 | 433 |
2021 - 2025 | 2,310 |
| $ | 3,477 |
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 |  | Nine months ended
| September 30, 2016 |  | October 2, 2015 |  | September 30, 2016 |  | October 2, 2015
Stock-based compensation in: |  |  |  |  |  |  |
Cost of revenue | $ | 360 |  |  | $ | 433 |  |  | $ | 1,011 |  |  | $ | 1,383 |
Research and development expense | 771 |  |  | 1,074 |  |  | 2,581 |  |  | 3,249 |
Selling, general and administrative expense | 1,549 |  |  | 2,320 |  |  | 4,950 |  |  | 7,213 |
Total stock-based compensation in operating expense | 2,320 |  |  | 3,394 |  |  | 7,531 |  |  | 10,462 |
Total stock-based compensation | $ | 2,680 |  |  | $ | 3,827 |  |  | $ | 8,542 |  |  | $ | 11,845 |
Valuation Assumptions for Stock Options |
| Employee Stock Options
| Three months ended |  | Nine months ended
| September 30, 2016 |  | October 2, 2015 |  | September 30, 2016 |  | October 2, 2015
Expected term (years) | 4.30 |  |  | 4.60 |  |  | 4.30 |  |  | 4.70 |
Volatility | 39 | % |  | 37 | % |  | 36 | % |  | 38 | %
Risk-free interest rate | 1.0 | % |  | 1.5 | % |  | 1.4 | % |  | 1.6 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Schedule of Share-based Payment Award, Employee Stock Purchase Plan, Valuation Assumptions |
| ESPP Purchase Period Ending
| December 31, 2016 |  | July 1, 2016 |  | December 31, 2015 |  | June 30, 2015
Expected term (years) | 0.50 |  |  | 0.50 |  |  | 0.50 |  |  | 0.50 |
Volatility | 62 | % |  | 54 | % |  | 32 | % |  | 35 | %
Risk-free interest rate | 0.4 | % |  | 0.4 | % |  | 0.1 | % |  | 0.1 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %
Estimated weighted average fair value per share at purchase date | $0.98 |  | $1.19 |  | $1.64 |  | $1.75

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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 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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