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STOCK-BASED COMPENSATION PLANS (Tables)
 12 Months Ended
Dec. 31, 2018
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, 2018 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, 2018
435,187

 
$
14.71

 
 
 
 
Granted
—

 
$
—

 
 
 
 
Edgewater outstanding options converted to Ribbon options
312,452

 
$
1.97

 
 
 
 
Exercised
(15,935
)
 
$
4.58

 
 
 
 
Forfeited
(35,431
)
 
$
1.81

 
 
 
 
Expired
(114,212
)
 
$
14.33

 
 
 
 
Outstanding at December 31, 2018
582,061

 
$
9.01

 
4.82
 
$
774

Vested or expected to vest at December 31, 2018
560,325

 
$
9.27

 
4.67
 
$
720

Exercisable at December 31, 2018
428,097

 
$
11.47

 
3.60
 
$
366
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 and 2016 were estimated using the Black-Scholes valuation model with the following assumptions:
 
 
Year ended December 31,
 
 
2017
 
2016
Risk-free interest rate
 
1.22% - 1.95%
 
1.00% - 1.61%
Expected dividends
 
—
 
—
Weighted average volatility
 
51.1%
 
54.8%
Expected life (years)
 
5.0
 
5.0-10.0
Schedule of activity related to unvested restricted stock grants
The activity related to the Company's RSAs for the year ended December 31, 2018 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2018
1,696,582

 
$
7.68

Granted
1,123,956

 
$
6.90

Vested
(1,035,952
)
 
$
8.05

Forfeited
(276,575
)
 
$
7.36

Unvested balance at December 31, 2018
1,508,011

 
$
6.90




The activity related to the Company's RSUs for the year ended December 31, 2018 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2018
17,932

 
$
6.90

Granted
908,300

 
$
6.27

Vested
(242,110
)
 
$
5.57

Forfeited
(47,822
)
 
$
6.76

Unvested balance at December 31, 2018
636,300

 
$
6.52
Schedule of activity related to performance stock awards
The activity related to the Company's PSUs for the year ended December 31, 2018 was as follows:
 
Shares
 
Weighted
Average
Grant Date
Fair Value
Unvested balance at January 1, 2018
60,834

 
$
9.65

Granted
207,350

 
$
5.78

Vested
(57,768
)
 
$
9.90

Forfeited
—

 
$
—

Unvested balance at December 31, 2018
210,416

 
$
5.77
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, 2018, 2017 and 2016 as follows (in thousands):
 
Year ended December 31,
 
2018
 
2017
 
2016
Product cost of revenue
$
114

 
$
514

 
$
359

Service cost of revenue
345

 
1,448

 
1,314

Research and development
1,797

 
7,337

 
5,014

Sales and marketing
2,935

 
4,885

 
6,209

General and administrative
5,881

 
11,473

 
6,872

 
$
11,072

 
$
25,657

 
$
19,768
Schedule of common stock reserved for future issuance
Common stock reserved for future issuance at December 31, 2018 consists of the following:
Amended and Restated Stock Incentive Plan
3,501,214

ESPP
1,431,513

 
4,932,727