Stockholders' Equity (Tables)

6 Months Ended

Jun. 30, 2019

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

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

	June 30, 2019		December 31, 2018
Options and awards issued and outstanding		5,303,268		3,864,407
Shares available for issuance under 2015 Stock Option and Incentive Plan		956,329		904,785
Shares available for issuance under 2015 Employee Stock Purchase Plan		1,162,647		780,716
Total		7,422,244		5,549,908