Notes payable, September 2021 Advances on Future Receipts Financing (Details) $ / shares in Units, $ in Thousands	Sep. 27, 2021 USD ($) wk Payment $ / shares shares	Sep. 30, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($)
Advances on Future Receipts Financing [Abstract]
Initial liability		$ 48,686	$ 36,745
Debt discount		$ 5,617	$ 4,324
Warrant exercise price (in dollars per share) | $ / shares		$ 0.01
September 2021 Advances on Future Receipts Financing [Member]
Advances on Future Receipts Financing [Abstract]
Cash proceeds	$ 703
Sale of future receipts	$ 1,000
Non-recourse agreement term | wk	24
Minimum amount of receipts, payment	$ 59
Number of payments occurring at closing | Payment	4
Initial liability	$ 763
Debt discount	$ 60
Warrants to purchase common stock (in shares) | shares	5,555,556
Warrant exercise price (in dollars per share) | $ / shares	$ 0.18