Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	11,496,978	3,735,269
Stock Option
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	975,233	80,345
Warrants
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	10,516,377	3,302,093
Restricted Stock Units (RSUs)
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	4,491	18,620
Series A Preferred Stock
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	877	877
Series C Convertible Preferred Stock
Net Loss Per Share
Antidilutive securities excluded from the calculation of basic and diluted loss per share (in shares)	0	333,334