Employee Benefit Plans (Tables)

12 Months Ended

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	%