Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2018

Reserved for Future Issuance

Schedule of Common Stock reserved for future issuance

	As of December 31,
	2018	2017
Warrants for the purchase of Common Stock	4,202,449	2,454
Options outstanding to purchase Common Stock	433,389	283,277
Options reserved to purchase Common Stock	877,917	83,739
Employee Stock Purchase Plan	76,011	52,365
Total	5,589,766	421,835