Subsequent Events, May 2022 Advances on Future Receipts Financing (Details) $ / shares in Units, $ in Thousands	May 19, 2022 USD ($) wk $ / shares shares	Mar. 31, 2022 $ / shares	Dec. 31, 2021 $ / shares
Subsequent Event [Abstract]
Warrant exercise price (in dollars per share) | $ / shares		$ 0.18	$ 0.20
Subsequent Event [Member] | May 2022 Advances on Future Receipts Financing [Member]
Subsequent Event [Abstract]
Balance paid	$ 400
Cash proceeds	545
Sale of future receipts	$ 1,000
Non-recourse agreement term | wk	24
Minimum amount of receipts, payment	$ 59
Receipts of remaining term | wk	24
Warrants to purchase common stock (in shares) | shares	5,555,556
Warrant exercise price (in dollars per share) | $ / shares	$ 0.18
Warrants expire term	4 years