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STOCK-BASED COMPENSATION (Tables)
 3 Months Ended
Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of equity incentive plan
A summary of the Company's equity incentive plan is as follows (in thousands):
 
 
March 31, 2019
Common stock shares available for grant
 
917

Stock options outstanding
 
2,268

RSAs outstanding
 
63

RSUs outstanding
 
801
Schedule of time-based stock options
The following summarizes activities for the time-based stock options for the three months ended March 31, 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
 
269

 
$
9.82

 
 
 
 
Exercises
 
(12
)
 
$
6.02

 
 
 
 
Cancelled or expired
 
(122
)
 
$
9.92

 
 
 
 
Outstanding as of March 31, 2019
 
1,996

 
$
9.48

 
2.77
 
$
361

Vested and expected to vest at March 31, 2019
 
1,996

 
$
9.48

 
2.77
 
$
348

Exercisable at March 31, 2019
 
1,466

 
$
9.29

 
1.56
 
$
283
Schedule of RSU activities
The following summarizes RSU activities for the three months ended March 31, 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
 
458

 
$
9.50

 

 


Released
 
(698
)
 
$
11.38

 

 


Forfeited
 
(50
)
 
$
9.89

 

 


Outstanding at March 31, 2019
 
801

 
$
9.84

 
1.71
 
$
6,754
Schedule Restricted Stock Awards activities
The following summarizes RSA activities for the three months ended March 31, 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
 
8

 
$
9.94

 
 
Released
 
—

 
$
—

 
 
Forfeited
 
—

 
$
—

 
 
Outstanding at March 31, 2019
 
63

 
$
12.63

 
0.23
Schedule of stock-based compensation expense
The following table summarizes stock-based compensation expenses recognized for the three months ended March 31, 2019 and 2018 (in thousands):
 
 
Three Months Ended
March 31,
 
 
2019
 
2018
Stock options
 
$
194

 
$
318

RSUs and RSAs
 
1,888

 
879

Employee stock purchases
 
21

 
25

Total
 
$
2,103

 
$
1,222

 
 
 
 
 
Sales and marketing
 
$
320

 
$
(67
)
Research and development
 
630

 
256

General and administrative
 
1,153

 
1,033

Total
 
$
2,103

 
$
1,222