Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Stockholders' Equity

Schedule of common reserved shares of common stock for issuance

	September 30,	December 31,
	2019	2018
	(unaudited)
Options issued and outstanding	3,821,690	42,979
Inducement options issued and outstanding	—	2,985
Options available for grant under stock option plans	554,016	2,327
RSU awards issued and outstanding	5,613	5,613
Warrants issued and outstanding	19,421,892	34,682
Convertible notes	—	10,849
Convertible preferred stock-Series A	473,565	47,357
Convertible preferred stock-Series B	985,500	—
Total	25,262,276	146,792