Common Stock Reserved for Issuance (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

	March 31, 2020		December 31, 2019
Shares reserved under Series A warrant		7,802,241		7,802,241
Shares reserved under Series B warrant		2,574,727		2,574,727
Shares reserved for future option grants under equity plans		3,025,897		51,514
Outstanding stock options under equity incentive plans		1,738,827		326,023
Outstanding warrant		727,122		1,839
Shares reserved under the 2015 employee stock purchase plan		17,500		17,500
Shares reserved for conversion of Series A Preferred Stock		—		7,803,273
Total common stock reserved for issuance		15,886,314		18,577,117