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Stockholders’ Equity (Tables)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Schedule of Shares of Common Stock Reserved for Future Issuance
As of March 31, 2020 and December 31, 2019, we reserved shares of common stock, on an as-if-converted basis, for future issuance as follows:
 
March 31,
 
December 31,
 
2020
 
2019
 
(in thousands)
Outstanding warrants to purchase common stock
695

 
695

Outstanding options to purchase common stock
12,629

 
14,020

Outstanding restricted stock units
4,713

 
5,208

Restricted stock awards subject to repurchase
614

 
736

Estimated shares for future ESPP purchase
1,843

 
890

Available for future issuance under 2019 Plan
11,866

 
8,160

Total
32,360

 
29,709