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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of activity related to outstanding stock options
The activity related to the Company's outstanding stock options during the year ended December 31, 2017 was as follows:
 
Number of
Shares
 
Weighted
Average
Exercise Price
 
Weighted
Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic Value
(in thousands)
Outstanding at January 1, 2016
5,610,106

 
$
15.73

 
 
 
 
Granted
7,760

 
$
6.67

 
 
 
 
Exercised
(105,688
)
 
$
5.85

 
 
 
 
Forfeited
(35,907
)
 
$
13.82

 
 
 
 
Expired
(5,041,084
)
 
$
16.02

 
 
 
 
Outstanding at December 31, 2017
435,187

 
$
14.71

 
4.30
 
$
66

Vested or expected to vest at December 31, 2017
435,187

 
$
14.71

 
4.30
 
$
66

Exercisable at December 31, 2017
435,187

 
$
14.71

 
4.30
 
$
66
Schedule of assumptions used to estimate the fair value of options at the date of grant using the Black-Scholes option pricing model
The grant date fair values of options to purchase common stock granted in the years ended December 31, 2017, 2016 and 2015 were estimated using the Black-Scholes valuation model with the following assumptions:
 
Year ended December 31,
 
2017
 
2016
 
2015
Risk-free interest rate
1.22% - 1.95%
 
1.00% - 1.61%
 
1.46%-1.75%
Expected dividends
—
 
—
 
—
Weighted average volatility
51.1%
 
54.8%
 
54.3%
Expected life (years)
5.0
 
5.0-10.0
 
5.0-6.0
Schedule of activity related to unvested restricted stock grants
The activity related to the Company's RSAs for the year ended December 31, 2017 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2017
2,030,028

 
$
9.69

Granted
1,763,912

 
$
6.77

Unvested PSUs converted to RSAs in connection with the Merger
95,834

 
$
9.44

Vested
(2,080,179
)
 
$
8.93

Forfeited
(113,013
)
 
$
8.80

Unvested balance at December 31, 2017
1,696,582

 
$
7.68

The activity related to the Company's RSUs for the year ended December 31, 2017 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2017
110,219

 
$
11.95

Granted
—

 
$
—

Vested
(80,374
)
 
$
7.06

Forfeited
(11,913
)
 
$
8.66

Unvested balance at December 31, 2017
17,932

 
$
6.99
Schedule of activity related to performance stock awards
The activity related to the Company's PSUs for the year ended December 31, 2017 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2017
147,085

 
$
12.11

Granted
165,000

 
$
8.45

Unvested PSUs converted to RSAs in connection with the Merger
(95,834
)
 
$
9.44

Vested
(145,357
)
 
$
9.44

Forfeited
(10,060
)
 
$
11.87

Unvested balance at December 31, 2017
60,834

 
$
9.65
Schedule of stock-based compensation expenses which are included in condensed consolidated statement of operations
The consolidated statements of operations included stock-based compensation for the years ended December 31, 2017, 2016 and 2015 as follows (in thousands):
 
Year ended December 31,
 
2017
 
2016
 
2015
Product cost of revenue
$
514

 
$
359

 
$
317

Service cost of revenue
1,448

 
1,314

 
1,524

Research and development
7,337

 
5,014

 
5,439

Sales and marketing
4,885

 
6,209

 
5,423

General and administrative
11,473

 
6,872

 
8,996

 
$
25,657

 
$
19,768

 
$
21,699
Schedule of common stock reserved for future issuance
Common stock reserved for future issuance at December 31, 2017 consists of the following:
Amended and Restated Stock Incentive Plan
5,359,243

ESPP
1,431,513

 
6,790,756