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Employee Benefit Plans (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Company's Stock Option and Restricted Stock Unit Activity
Stock Option and RSU activities
The following table summarizes the Company’s stock option and RSU activities during the year ended December 31, 2017 (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, 2016
3,912

 
5,019

 
$
6.01

 
3,864

 
$
4.26

Authorized
7,400

 
—

 
—

 
—

 


Granted
(5,351
)
 
30

 
5.10

 
3,546

 
5.12

Options exercised
—

 
(106
)
 
2.97

 
—

 


Shares released
—

 
—

 
—

 
(3,184
)
 
4.10

Forfeited or canceled
3,043

 
(1,063
)
 
6.18

 
(1,322
)
 
5.14

Balance at December 31, 2017
9,004

 
3,880

 
$
6.04

 
2,904

 
$
5.09
Summary of Stock Options Outstanding
The following table summarizes information about stock options outstanding as of December 31, 2017 (in thousands, except per share amounts and term):
 
Number
of
Shares
 
Weighted
Average
Exercise
Price
 
Weighted
Average
Remaining
Contractual
Term (Years)
 
Aggregate
Intrinsic
Value
Vested and expected to vest
3,845

 
$
6.06

 
2.8
 
$
946

Exercisable
3,367

 
6.21

 
2.6
 
664
Summary of Restricted Stock Units Outstanding
The following table summarizes information about RSUs outstanding as of December 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
2,402

 
0.6
 
$
10,088
Schedule of Defined Benefit Plans Disclosures
The table below shows the present value of the Company’s pension obligations as of December 31, 2017 and December 31, 2016 and the changes to the Company’s pension obligations for each of those years (in thousands):
 
December 31,
 
2017
 
2016
Projected benefit obligation:
 
 
 
Balance at January 1
$
4,264

 
$
—

  Acquired from TVN acquisition
—

 
5,907

  Service cost
259

 
217

  Interest cost
71

 
87

  Actuarial (gains) losses
(528
)
 
279

  Curtailment (1)
—

 
(1,955
)
  Adjustment for prior year balance
343

 
—

  Foreign currency translation adjustment
624

 
(271
)
Balance at December 31
$
5,033

 
$
4,264

 
 
 
 
Presented on the Consolidated Balance Sheets under:
 
 
 
Current portion (presented under “Accrued and other current liabilities”)
$
34

 
27

Long-term portion (presented under “Other non-current liabilities”)
$
4,999

 
4,237
Components of Net Periodic Benefit Costs
The table below shows the components of net periodic benefit costs (in thousands):

 
Year ended December 31,
 
2017
 
2016
Service cost
$
259

 
$
217

Interest cost
71

 
87

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

 
—

  Net periodic benefit cost included in operating loss
$
330

 
$
304

(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,
 
2017
 
2016
 Discount rate
1.5
%
 
1.5
%
 Mobility rate
6.0
%
 
3.0
%
 Salary progression rate
2.0
%
 
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,
 
2018
$
34

2019
53

2020
—

2021
44

2022
143

2023 - 2027
2,858

 
$
3,132
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,
 
2017
 
2016
 
2015
Stock-based compensation in:
 
 
 
 
 
   Cost of revenue
$
2,370

 
$
1,554

 
$
1,862

   Research and development expense
5,313

 
3,711

 
4,435

   Selling, general and administrative expense
8,927

 
7,795

 
9,285

      Total stock-based compensation in operating expense
14,240

 
11,506

 
13,720

Total stock-based compensation recognized in net loss
$
16,610

 
$
13,060

 
$
15,582
Valuation Assumptions for Stock Options
The Company estimates the fair value of employee stock options and stock purchase rights under the ESPP using a Black-Scholes option valuation model. The value of the stock purchase rights under the ESPP consists of: (1) the 15% discount on the purchase of the stock; (2) 85% of the fair value of the call option; and (3) 15% of the fair value of the put option. The call option and put option were valued using the Black-Scholes option pricing model. 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
 
2015
 
2017
 
2016
 
2015
Expected term (in years)
4.30

 
4.30

 
4.65

 
0.50

 
0.50

 
0.50

Volatility
42
%
 
36
%
 
38
%
 
48
%
 
70
%
 
34
%
Risk-free interest rate
1.8
%
 
1.4
%
 
1.5
%
 
1.2
%
 
0.6
%
 
0.3
%
Expected dividends
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%
 
0.0
%