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Stockholders' Equity
 3 Months Ended
Mar. 31, 2020
Share-based Payment Arrangement [Abstract]  
Stockholders' Equity Stockholders' Equity

Share-based Compensation Expense

Total share-based compensation expense recorded for employees and non-employees is as follows (in thousands):
 
Three Months Ended March 31,
 
2020
 
2019
Cost of revenues
$
169

 
$
125

Research and development
6,991

 
4,917

Sales and marketing
2,186

 
1,808

General and administrative
8,988

 
8,188

Total share-based compensation expense
$
18,334

 
$
15,038



RSU and PSU Activity

Activity for RSUs and PSUs is as follows:
 
RSUs and PSUs Outstanding
 
Shares
Outstanding
 
Weighted 
Average Grant Date 
Fair Value
Balance at December 31, 2019
6,909,530

 
$
24.04

Granted
1,760,947

 
38.74

Released
(2,793,397
)
 
16.89

Canceled
(214,121
)
 
28.64

Balance at March 31, 2020
5,662,959

 
$
31.96



As of March 31, 2020, our total unrecognized share-based compensation expense related to RSUs and PSUs was approximately $126.5 million, which will be recognized over the remaining weighted-average vesting period of approximately 2.3 years.