Stockholders' Equity (Deficit) (Tables)

3 Months Ended

Mar. 31, 2020

Equity [Abstract]

Schedule of Reserved Shares of Common Stock for Future Issuance

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

	March 31, 2020	December 31, 2019
Outstanding stock options (Note 10)	2,106,770	1,789,303
Warrants to purchase common stock issued in January 2018 Offering (Note 9)	10,000,000	10,000,000
Warrants to purchase common stock issued in March 2020 Public Offering (Note 9)	12,078,292	—
Warrants to purchase common stock issued in March 2020 Registered Direct Offering (Note 9)	558,140	—
Pre-funded warrants to purchase common stock issued in March 2020 Registered Direct Offering (Note 9)	3,452,326	—
Outstanding stock appreciation rights (Note 10)	600,000	1,000,000
For possible future issuance under 2016 Stock Plan (Note 10)	441,663	388,463
	29,237,191	13,177,766