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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Common Stock Reserved for Future Issuance The following table presents common stock reserved for future issuance for the following equity instruments as of December 31, 2019 and 2018 (in thousands):
 December 31,
 20192018
Stock options and RSUs outstanding4,692  4,033  
Warrants to purchase common stock28  28  
Available for future grants under employee equity plans4,926  1,684  
Total common stock reserved for future issuance9,646  5,745