Common Stock Reserved for Issuance (Tables)

3 Months Ended

Mar. 31, 2019

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

The Company is required to reserve and keep available out of its authorized but unissued shares of common stock a number of shares sufficient to effect the conversion of all outstanding options granted and available for grant under the incentive plans, shares reserved for issuance under the employee stock purchase plan and issued warrant.

	March 31, 2019		December 31, 2018
Outstanding stock options under equity incentive plans		13,198,385		10,504,412
Shares reserved for future option grants under equity incentive plans		1,903,372		1,945,025
Shares reserved under the 2015 employee stock purchase plan		700,000		700,000
Shares reserved under warrant upon contingent events		147,059		147,059
Outstanding warrant		73,529		73,529
Total common stock reserved for issuance		16,022,345		13,370,025