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STOCK-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2020
Share-based Payment Arrangement [Abstract]  
Summary of equity incentive program
A summary of our equity incentive program is as follows (in thousands):

 
June 30,
2020
Common stock shares available for grant
2,776

Stock options outstanding
1,370

RSAs outstanding
130

RSUs outstanding
1,124
Summary of time-based stock options
The following summarizes activities for the time-based stock options for the six months ended June 30, 2020 (in thousands except for weighted average exercise price 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 at December 31, 2019
967

 
$
8.55

 
5.63
 
$
16

Granted
456

 
$
7.58

 
 
 
 
Canceled or expired
(53
)
 
$
9.73

 
 
 
 
Outstanding as of June 30, 2020
1,370

 
$
8.18

 
5.84
 
$
—

Vested and expected to vest at June 30, 2020
1,178

 
$
8.23

 
5.78
 
$
—

Exercisable at June 30, 2020
344

 
$
8.89

 
4.76
 
$
—
Summary of restricted stock units activities
The following summarizes RSU activities for the six months ended June 30, 2020 (in thousands except for weighted average grant date fair value and weighted average remaining contractual life data):

 
Number of Restricted Stock Units
 
Weighted Average Grant Date Fair Value
 
Weighted Average
Remaining Contractual Life
(Years)
 
Aggregate
Intrinsic Value
Outstanding at December 31, 2019
945

 
$
8.81

 
1.25
 
$
7,020

Granted
507

 
$
5.93

 

 


Released
(301
)
 
$
9.00

 

 


Forfeited
(27
)
 
$
8.18

 

 


Outstanding at June 30, 2020
1,124

 
$
7.47

 
1.40
 
$
7,004
Summary of restricted stock awards activities
The following summarizes RSA activities for the six months ended June 30, 2020 (in thousands except for weighted average grant date fair value and weighted average remaining recognition period):

 
Number of Restricted Stock Awards
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Recognition Period
(Years)
Outstanding at December 31, 2019
91

 
$
7.45

 
0.45
Granted
142

 
$
6.43

 
 
Released
(71
)
 
$
7.18

 
 
Forfeited
(32
)
 
$
7.27

 
 
Outstanding at June 30, 2020
130

 
$
6.53

 
0.95
Summary of stock-based compensation expenses
The following table summarizes stock-based compensation expenses recognized for the three and six months ended June 30, 2020 and 2019 (in thousands):

 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020
 
2019
 
2020
 
2019
Stock options
$
298

 
$
122

 
$
553

 
$
316

RSUs and RSAs
1,056

 
938

 
1,518

 
2,826

Employee stock purchase plan
11

 
21

 
23

 
42

Total
$
1,365

 
$
1,081

 
$
2,094

 
$
3,184

 
 
 
 
 
 
 
 
Sales and marketing
$
343

 
$
173

 
$
388

 
$
493

Research and development
251

 
190

 
420

 
820

General and administrative
771

 
718

 
1,286

 
1,871

Total
$
1,365

 
$
1,081

 
$
2,094

 
$
3,184
Summary of assumptions used to value options granted
The assumptions used to value options granted under our equity incentive program are as follows:

 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2020 (1)
 
2019
 
2020
 
2019
Expected life (in years)
N/A
 
4.4

 
4.2

 
4.5

Volatility
N/A
 
53
%
 
52
%
 
53
%
Interest rate
N/A
 
1.8
%
 
1.0
%
 
2.3
%
Dividend yield
N/A
 
—
%
 
—
%
 
—
%