Subsequent Events, February 2022 Second Amendment to Note and Warrant Purchase and Security Agreement (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2021	Feb. 25, 2022
Subsequent Event [Abstract]
Warrant exercise price (in dollars per share)	$ 0.01
February 2022 Second Amendment to Note and Warrant Purchase and Security Agreement [Member]
Subsequent Event [Abstract]
Warrants term period	10 years
February 2022 Second Amendment to Note and Warrant Purchase and Security Agreement [Member] | Subsequent Event [Member]
Subsequent Event [Abstract]
Principal amount		$ 3
Issuance of advisor shares (in shares)		20,666,993
Percentage of additional fully-diluted common stock for warrant to become exercisable		2.00%
Warrant exercise price (in dollars per share)		$ 0.18