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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [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, 2018 (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, 2017
3,880

 
$
6.04

 
 
 
 
Granted
—

 
—

 
 
 
 
Exercised
(239
)
 
3.79

 
 
 
 
Forfeited
(35
)
 
4.76

 
 
 
 
Canceled or expired
(538
)
 
8.75

 
 
 
 
Balance at December 31, 2018
3,068

 
5.76

 
2.3
 
$
1,148.7

As of December 31, 2018
 
 
 
 
 
 
 
Vested and expected to vest
3,067

 
$
5.76

 
2.3
 
$
1,147.7

Exercisable
2,994

 
$
5.78

 
2.3
 
$
1,082.0
Summary of Restricted Stock Units Outstanding
The following table summarizes the Company’s RSUs activities and related information during the year ended December 31, 2018 (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, 2017
2,904

 
$
5.09

Granted
3,906

 
3.97

Vested
(3,177
)
 
4.91

Forfeited
(230
)
 
4.89

Balance at December 31, 2018
3,403

 
$
3.99
Schedule of Defined Benefit Plans Disclosures
The Company’s pension obligations as of December 31, 2018 and December 31, 2017 and the changes to the Company’s pension obligations for each of those years were as follows (in thousands):
 
December 31,
 
2018
 
2017
Projected benefit obligation:
 
 
 
Balance at January 1
$
5,033

 
$
4,264

  Service cost
243

 
259

  Interest cost
74

 
71

  Actuarial (gains) losses
(202
)
 
(528
)
  Benefits paid
(13
)
 
—

  Adjustment for prior year balance
—

 
343

  Foreign currency translation adjustment
(254
)
 
624

Balance at December 31
$
4,881

 
$
5,033

 
 
 
 
Presented on the Consolidated Balance Sheets under:
 
 
 
Current portion (presented under “Accrued and other current liabilities”)
$
63

 
34

Long-term portion (presented under “Other non-current liabilities”)
$
4,818

 
4,999
Components of Net Periodic Benefit Costs
The table below presents the components of net periodic benefit costs (in thousands):

 
Year ended December 31,
 
2018
 
2017
Service cost
$
243

 
$
259

Interest cost
74

 
71

Amortization of net actuarial loss (gain) (1)
—

 
—

  Net periodic benefit cost included in operating loss
$
317

 
$
330

(1) The Company uses the allowable 10% corridor approach to determine the amount of actuarial gains or losses subject to amortization in pension cost. Gains or losses are amortized on a straight-line basis over the average future remaining service period of active plan participants.
Schedule of Pension Obligations Assumptions Used
The following assumptions were used in determining the Company’s pension obligation:
 
December 31,
 
2018
 
2017
 Discount rate
1.7
%
 
1.5
%
 Mobility rate
6.0
%
 
6.0
%
 Salary progression rate
2.0
%
 
2.0
%
Schedule of Expected Benefit Payments
As of December 31, 2018, 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,
 
2019
$
63

2020
—

2021
41

2022
80

2023
479

2024 - 2028
2,626

 
$
3,289
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,
 
2018
 
2017
 
2016
Stock-based compensation in:
 
 
 
 
 
   Cost of revenue
$
1,953

 
$
2,370

 
$
1,554

   Research and development expense
5,192

 
5,313

 
3,711

   Selling, general and administrative expense
10,144

 
8,927

 
7,795

      Total stock-based compensation in operating expense
15,336

 
14,240

 
11,506

Total stock-based compensation recognized in net loss
$
17,289

 
$
16,610

 
$
13,060
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
 
2016
 
2018
 
2017
 
2016
Expected term (in years)
4.30

 
4.30

 
0.50

 
0.50

 
0.50

Volatility
42
%
 
36
%
 
55
%
 
48
%
 
70
%
Risk-free interest rate
1.8
%
 
1.4
%
 
1.9
%
 
1.2
%
 
0.6
%
Expected dividends
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%