Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2019

Stockholders' Equity

Schedule of common reserved shares of common stock for issuance

	December 31,	December 31,
	2019	2018
Options issued and outstanding	3,902,675	42,059
Inducement options issued and outstanding	74	2,984
Options available for grant under stock option plans	479,829	2,327
Restricted stock unit awards issued and outstanding	5,613	5,613
Warrants issued and outstanding	19,421,892	34,681
Convertible notes	—	10,849
Series A convertible preferred stock	473,565	47,357
Series B convertible preferred stock	985,500	—
Series B-2 convertible preferred stock	1,931,350	—
Total	27,200,498	145,870