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STOCK-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of equity incentive program
A summary of the Company's equity incentive program is as follows (in thousands):

 
December 31, 2019
Common stock shares available for grant
4,214

Standard and market condition-based stock options outstanding
967

RSAs outstanding
91

RSUs outstanding
945
Summary of time-based stock options
The following summarizes activities for the time-based stock options for the year ended December 31, 2019:

 
Number of Shares
Underlying Stock Options
(in thousands)
 
Weighted Average
Exercise Price
Per Share
 
Weighted Average
Remaining Contractual Life
(Years)
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2018
1,862

 
$
9.44

 
2.85
 
$
751

Granted
783

 
$
8.25

 
 
 
 
Exercised
(174
)
 
$
7.15

 
 
 
 
Canceled or expired
(1,504
)
 
$
9.65

 
 
 
 
Outstanding as of December 31, 2019
967

 
$
8.55

 
5.63
 
$
16

Vested and expected to vest at December 31, 2019
967

 
$
8.55

 
5.63
 
$
16

Exercisable at December 31, 2019
161

 
$
9.80

 
2.12
 
$
0.4
Summary of restricted stock units activities
The following summarizes RSUs activities for the year ended December 31, 2019:

 
Number of Restricted Stock Units
(in thousands)
 
Weighted Average Grant Date Fair Value
 
Weighted Average
Remaining Contractual Life
(Years)
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2018
1,091

 
$
10.97

 
0.67
 
$
9,773

Granted
892

 
$
8.54

 
 
 
 
Released
(714
)
 
$
11.30

 
 
 
 
Forfeited
(324
)
 
$
9.85

 
 
 
 
Outstanding at December 31, 2019
945

 
$
8.81

 
1.25
 
$
7,020
Summary of restricted stock awards activities
The following summarizes RSA activities for the year ended December 31, 2019:

 
Number of Restricted Stock Awards
(in thousands)
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 2018
55

 
$
13.02

 
0.46
Granted
114

 
$
7.60

 
 
Released
(62
)
 
$
12.63

 
 
Forfeited
(16
)
 
$
7.27

 
 
Outstanding at December 31, 2019
91

 
$
7.45

 
0.45
Summary of stock-based compensation expenses
The stock-based compensation related to all of our stock-based awards and ESPP for the years ended December 31, 2019, 2018 and 2017 is as follows (in thousands):

 
For the Years Ended December 31,
 
2019
 
2018
 
2017
Stock options
$
701

 
$
1,222

 
$
3,735

RSUs and RSAs
4,692

 
7,372

 
2,234

Employee stock purchase plan
71

 
92

 
$
133

Total
$
5,464

 
$
8,686

 
$
6,102

 
 
 
 
 
 
Sales and marketing
$
947

 
$
946

 
$
1,025

Research and development
1,304

 
1,948

 
981

General and administrative
3,213

 
5,792

 
4,096

Total
$
5,464

 
$
8,686

 
$
6,102
Summary of assumptions used to value option grants
The assumptions used to value options granted under the Company’s equity incentive program are as follows:

Time-based stock options:
 
 
 
 
 
 
For the Year Ended December 31,
 
2019
 
2018
 
2017
Expected life (in years)
4.4

 
4.4

 
4.6

Volatility
53
%
 
55
%
 
52
%
Interest rate
2.0
%
 
3.0
%
 
2.0
%
Dividend yield
—

 
—

 
—


Market condition based stock options:
 
 
 
 
 
 
For the Years Ended December 31,
 
2019 (1)
 
2018 (1)
 
2017
Expected life (in years)
N/A
 
N/A
 
7.0

Volatility
N/A
 
N/A
 
55
%
Interest rate
N/A
 
N/A
 
2.0
%
Dividend yield
N/A
 
N/A
 
—
%
(1) No market condition based stock options were granted during the years ended December 31, 2019 and 2018