Stockholders' Equity and Derivative Liability - Warrants - Series C Convertible Preferred Stock Issuance (Details)		12 Months Ended
	Jul. 03, 2018 $ / shares shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares
Preferred stock, Common Stock and Warrant Offering
Preferred shares converted into common stock (in shares)		101	92
Warrants
Preferred stock, Common Stock and Warrant Offering
Warrants issued (in shares)	88,928
Series C
Preferred stock, Common Stock and Warrant Offering
Convertible preferred stock, shares issued (in shares)		1,806	1,817
Issuance of common stock, net (in shares)	10,826
Convertible preferred stock, par value (in dollars per share) | $ / shares	$ 1,000	$ 1,000	$ 1,000
Convertible preferred stock, shares outstanding (in shares)		1,806	1,817
Stock issued as a result of conversion (in shares)		11	10
Conversion ratio	1.55
Series C | Preferred Stock
Preferred stock, Common Stock and Warrant Offering
Convertible preferred stock, shares issued (in shares)	1