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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2019
Equity [Abstract]  
Common Stock are Reserved for Future Issuance
As of March 31, 2019, the Company has shares of common stock reserved for future issuance for as follows (in thousands):

 
March 31, 2019
Warrants outstanding
17,698

Stock options outstanding
1,333

Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan
362

Shares reserved for future issuance under the Employee Stock Purchase Plan
265

Restricted stock units
13

Total reserved for future issuance
19,671