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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Options Outstanding | The following table summarizes the Company’s stock option activities and related information during the year ended December 31, 2019 (in thousands, except per share amounts and terms):
| Stock Options Outstanding
| Number of Shares |  | Weighted Average Exercise Price (per share) |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Balance at December 31, 2018 | 3,068 |  |  | $ | 5.76 |  |  |  |  |
Granted | — |  |  | — |  |  |  |  |
Exercised | (801 | ) |  | 5.40 |  |  |  |  |
Forfeited | — |  |  | — |  |  |  |  |
Canceled or expired | (379 | ) |  | 6.14 |  |  |  |  |
Balance at December 31, 2019 | 1,888 |  |  | 5.83 |  |  | 1.8 |  | $ | 3,715.5 |
As of December 31, 2019 |  |  |  |  |  |  |
Vested and expected to vest | 1,888 |  |  | $ | 5.83 |  |  | 1.8 |  | $ | 3,715.5 |
Exercisable | 1,888 |  |  | $ | 5.83 |  |  | 1.8 |  | $ | 3,715.5 |
Summary of Restricted Stock Units Outstanding | The following table summarizes the Company’s RSUs activities and related information during the year ended December 31, 2019 (in thousands, except per share amounts and terms):
| Restricted Stock Units Outstanding
| Number of Shares |  | Weighted Average Grant Date Fair Value Per Share
Balance at December 31, 2018 | 3,403 |  |  | $ | 3.99 |
Granted | 2,717 |  |  | 5.78 |
Vested | (2,421 | ) |  | 4.02 |
Forfeited | (98 | ) |  | 5.10 |
Balance at December 31, 2019 | 3,601 |  |  | $ | 5.18 |
Schedule of Defined Benefit Plans Disclosures | The Company’s pension obligations as of December 31, 2019 and December 31, 2018 and the changes to the Company’s pension obligations for each of those years were as follows (in thousands):
| December 31,
| 2019 |  | 2018
Projected benefit obligation: |  |  |
Balance at January 1 | $ | 4,881 |  |  | $ | 5,033 |
Service cost | 227 |  |  | 243 |
Interest cost | 78 |  |  | 74 |
Actuarial (gains) losses | 206 |  |  | (202 | )
Benefits paid | (31 | ) |  | (13 | )
Foreign currency translation adjustment | (102 | ) |  | (254 | )
Balance at December 31 | $ | 5,259 |  |  | $ | 4,881 |
Presented on the Consolidated Balance Sheets under: |  |  |
Current portion (presented under “Accrued and other current liabilities”) | $ | 30 |  |  | 63 |
Long-term portion (presented under “Other non-current liabilities”) | $ | 5,229 |  |  | 4,818 |
Components of Net Periodic Benefit Costs | The table below presents the components of net periodic benefit costs (in thousands):
| Year ended December 31,
| 2019 |  | 2018
Service cost | $ | 227 |  |  | $ | 243 |
Interest cost | 78 |  |  | 74 |
Net periodic benefit cost included in operating loss | $ | 305 |  |  | $ | 317 |
Schedule of Pension Obligations Assumptions Used | The following assumptions were used in determining the Company’s pension obligation:
| December 31,
| 2019 |  | 2018
Discount rate | 0.7 | % |  | 1.7 | %
Mobility rate | 5.0 | % |  | 6.0 | %
Salary progression rate | 2.0 | % |  | 2.0 | %
Schedule of Expected Benefit Payments | As of December 31, 2019, 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, |
2020 | $ | 30 |
2021 | 12 |
2022 | — |
2023 | 315 |
2024 | 370 |
2025 - 2029 | 3,105 |
| $ | 3,832 |
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table summarizes stock-based compensation expense for all plans (in thousands):
| Year ended December 31,
| 2019 |  | 2018 |  | 2017
Stock-based compensation in: |  |  |  |  |
Cost of revenue | $ | 1,124 |  |  | $ | 1,953 |  |  | $ | 2,370 |
Research and development expense | 3,261 |  |  | 5,192 |  |  | 5,313 |
Selling, general and administrative expense | 7,689 |  |  | 10,144 |  |  | 8,927 |
Total stock-based compensation in operating expense | 10,950 |  |  | 15,336 |  |  | 14,240 |
Total stock-based compensation recognized in net loss | $ | 12,074 |  |  | $ | 17,289 |  |  | $ | 16,610 |
Valuation Assumptions for Stock Options | At the date of grant, the Company estimated the fair value of each stock option grant and stock purchase right granted under the ESPP using the following weighted average assumptions:
| Employee Stock Options |  | ESPP
| 2017 |  | 2019 |  | 2018 |  | 2017
Expected term (in years) | 4.30 |  |  | 0.50 |  |  | 0.50 |  |  | 0.50 |
Volatility | 42 | % |  | 38 | % |  | 55 | % |  | 48 | %
Risk-free interest rate | 1.8 | % |  | 2.3 | % |  | 1.9 | % |  | 1.2 | %
Expected dividends | 0.0 | % |  | 0.0 | % |  | 0.0 | % |  | 0.0 | %

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