Stockholders' Equity (Tables)

12 Months Ended

Dec. 31, 2020

Stockholders' Equity

Schedule of common reserved shares of common stock for issuance

	December 31,
	2020	2019
Options issued and outstanding	4,456,748	3,902,675
Inducement options issued and outstanding	114,892	74
Options available for grant under stock option plans	596,597	479,829
Restricted stock unit awards issued and outstanding	5,613	5,613
Warrants issued and outstanding	7,205,454	19,421,892
Series A convertible preferred stock	—	473,565
Series B convertible preferred stock	—	985,500
Series B-2 convertible preferred stock	—	1,931,350
Total	12,379,304	27,200,498