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Equity Incentive Plans and Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2020
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock-based Compensation
A summary of our stock-based compensation expense is as follows (in thousands):
 
Three Months Ended March 31,
 
2020
 
2019
Stock-based compensation by type of award:
 
 
 
Stock options
$
110

 
$
184

Stock awards
2,682

 
3,474

Employee stock purchase rights
248

 
238

 
$
3,040

 
$
3,896

 
 
 
 
Stock-based compensation by category of expense:
 
 
 
Cost of revenue
$
325

 
$
324

Sales and marketing
764

 
1,321

Research and development
1,006

 
1,331

General and administrative
945

 
920

 
$
3,040

 
$
3,896

 
 
 
 


Summary of Activity under Stock Option Plans
The following tables summarize our stock option activities and related information:
 
Number of Shares
(thousands)
 
Weighted-Average Exercise Price per Share
 
Weighted-Average Remaining Contractual Term
(years)
 
Aggregate Intrinsic Value
(thousands)
Outstanding as of December 31, 2019
3,702

 
$
5.57

 
 
 
 
Granted

 

 
 
 
 

Exercised
(644
)
 
4.37

 
 
 
 
Canceled
(171
)
 
6.29

 
 
 
 

Outstanding as of March 31, 2020
2,887

 
5.80

 
3.01
 
$
3,195

Vested and exercisable as of March 31, 2020
2,810

 
$
5.73

 
2.90
 
$
3,194

 
 
 
 
 
 
 
 


Summary of Restricted Stock Units Activity
The following table summarizes our stock award activities and related information:
 
Number of Shares
(thousands)
 
Weighted-Average Grant Date Fair Value per Share
 
Weighted-Average Remaining Vesting Term
(years)
Nonvested as of December 31, 2019
6,148

 
$
6.59

 
 
Granted
132

 
5.75

 
 
Released
(486
)
 
6.42

 
 
Canceled
(511
)
 
6.67

 
 
Nonvested as of March 31, 2020
5,283

 
$
6.58

 
1.75