Common Stock (Tables)

3 Months Ended

Mar. 31, 2020

Common Stock

Schedule of shares of common stock reserved for issuance

	March 31,	December 31,
	2020	2019
Exchange warrants	1,458,000	1,458,000
Shares available for future option grants	2,745,773	1,704,183
Outstanding options	5,719,820	5,643,410
Shares reserved for employee stock purchase plan	400,000	400,000
Total	10,323,593	9,205,593