Common Stock Reserved for Future Issuance (Tables)

6 Months Ended

Jun. 30, 2018

Common Stock Reserved for Future Issuance

Schedule of Common Stock reserved for future issuance

	As of June 30,
	2018	2017
Warrants for the purchase of Common Stock	42,024,566	24,566
Options to purchase Common Stock	4,612,684	3,669,791
Employee Stock Purchase Plan	760,111	523,659
Total	47,397,361	4,218,016