Stockholders' Equity (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

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

	March 31, 2019		December 31, 2018
Options and awards issued and outstanding		5,257,140		3,864,407
Shares available for issuance under 2015 Stock Option and Incentive Plan		1,077,783		904,785
Shares available for issuance under 2015 Employee Stock Purchase Plan		1,183,605		780,716
Total		7,518,528		5,549,908