Subsequent Events, Second Amendment to Note and Warrant Purchase and Security Agreement (Details) - USD ($) $ / shares in Units, $ in Millions	May 03, 2022	Feb. 25, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Subsequent Event [Abstract]
Issuance of warrants (in shares)			204,882,664	190,356,736	9,474,091
Warrant exercise price (in dollars per share)			$ 0.20	$ 0.19	$ 0.11
Second Amendment to Note and Warrant Purchase and Security Agreement [Member]
Subsequent Event [Abstract]
Warrants and Rights Outstanding, Term			10 years
Subsequent Event [Member] | Second Amendment to Note and Warrant Purchase and Security Agreement [Member]
Subsequent Event [Abstract]
Proceeds from issuance of debt	$ 3.0
Principal amount	$ 3.0
Issuance of advisor shares (in shares)	20,700,000
Issuance of warrants (in shares)	15,500,000
Warrant exercise price (in dollars per share)		$ 0.18