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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Summary of equity incentive plan
A summary of the Company's equity incentive plan is as follows (in thousands):

 
 
June 30, 2019
Common stock shares available for grant
 
3,642

Stock options outstanding
 
2,035

RSAs outstanding
 
80

RSUs outstanding
 
753
Schedule of time-based stock options
The following summarizes activities for the time-based stock options for the six months ended June 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

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

 
$
9.44

 
2.85
 
$
751

Granted
 
369

 
$
9.13

 
 
 
 
Exercised
 
(62
)
 
$
6.01

 
 
 
 
Cancelled or expired
 
(406
)
 
$
10.02

 
 
 
 
Outstanding as of June 30, 2019
 
1,763

 
$
9.36

 
2.10
 
$
88

Vested and expected to vest at June 30, 2019
 
1,763

 
$
9.36

 
2.10
 
$
88

Exercisable at June 30, 2019
 
1,324

 
$
9.46

 
0.68
 
$
29
Schedule of RSU activities
The following summarizes RSU activities for the six months ended June 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

 
 
Number of Restricted Stock Units
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Service
(Years)
 
Aggregate
Intrinsic Value
Outstanding as of December 31, 2018
 
1,091

 
$
10.97

 
0.67
 
$
9,773

Granted
 
586

 
$
9.06

 

 


Released
 
(698
)
 
$
11.38

 

 


Forfeited
 
(226
)
 
$
9.73

 

 


Outstanding at June 30, 2019
 
753

 
$
9.48

 
1.57
 
$
5,729
Schedule Restricted Stock Awards activities
The following summarizes RSA activities for the six months ended June 30, 2019 (in thousands except for weighted average exercise per share and weighted average remaining contractual life data):

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

 
$
13.02

 
0.46
Granted
 
88

 
$
7.51

 
 
Released
 
(63
)
 
$
12.63

 
 
Forfeited
 
—

 
$
—

 
 
Outstanding at June 30, 2019
 
80

 
$
7.27

 
0.96
Schedule of stock-based compensation expense
The following table summarizes stock-based compensation expenses recognized for the three and six months ended June 30, 2019 and 2018 (in thousands):

 
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
 
2019
 
2018
 
2019
 
2018
Stock options
 
$
122

 
$
356

 
$
316

 
$
674

RSUs and RSAs
 
938

 
2,149

 
2,826

 
3,028

Employee stock purchase plan
 
21

 
25

 
42

 
50

Total
 
$
1,081

 
$
2,530

 
$
3,184

 
$
3,752

 
 
 
 
 
 
 
 
 
Sales and marketing
 
$
173

 
$
366

 
$
493

 
$
299

Research and development
 
190

 
564

 
820

 
820

General and administrative
 
718

 
1,600

 
1,871

 
2,633

Total
 
$
1,081

 
$
2,530

 
$
3,184

 
$
3,752