Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

The following shares were reserved for future issuance:

	December 31, 2019
Common stock options outstanding and available for future grant	7,923,098
Warrants to purchase common stock	9,692,879
Employee Stock Purchase Plan	142,872
	17,758,849

Schedule of Warrants Issued and Outstanding

As of December 31, 2019, the following warrants for common stock were issued and outstanding:

Issue date	Expiration date	Exercise price		Number of warrants outstanding
January 11, 2017	None	$	0.001	5,133,230
November 20, 2017	None	$	0.001	4,137,999
June 11, 2018	None	$	0.001	421,650
				9,692,879