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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Common Stock are Reserved for Future Issuance
Shares of common stock reserved for future issuance are as follows (in thousands):

 
December 31, 2018
Warrants outstanding
17,698

Stock options outstanding
395

Options reserved for future issuance under the Company’s 2017 Equity Incentive Plan
421

Shares reserved for future issuance under the Employee Stock Purchase Plan
115

Restricted stock units
13

Total reserved for future issuance
18,642