Common Stock Reserved for Issuance (Tables)

9 Months Ended

Sep. 30, 2020

Equity [Abstract]

Schedule of Common Stock Reserved for Issuance

At-The-Market Common Stock Offering

In August 2020, the Company entered into an open market sale agreement, pursuant to which it can issue and sell an aggregate of up to $20.0 million of its common stock from time to time in ATM offerings. During the three months ended September 30, 2020, the Company sold 100,000 shares under the ATM program for net proceeds of $1.1 million, net of commissions and offering expenses.

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 warrants.

	September 30, 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		1,018,557		51,514
Outstanding stock options under equity incentive plans		4,246,167		326,023
Outstanding warrants		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		16,386,314		18,577,117