Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

The Company has reserved shares of common stock for issuance as follows:

	June 30, 2018		December 31, 2017
Options and awards issued and outstanding		3,904,668		2,964,549
Shares available for issuance under 2015 Stock Option and Incentive Plan		1,093,555		863,538
Shares available for issuance under 2015 Employee Stock Purchase Plan		794,724		449,444
Total		5,792,947		4,277,531