Summary of Significant Accounting Policies - Significant Changes in Contract Liabilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Deferred revenue
Beginning Balance	$ 946	$ 631
Cash receipts (Payments)	41,797	20,357
Less: Impact on Revenue	40,921	20,042
Other	0	0
Ending Balance	1,822	946
Payables to customers related to BTC
Beginning Balance	914	255,193
Cash receipts (Payments)	(215)	(257,235)
Less: Impact on Revenue	0	(1,082)
Other	0	1,874
Ending Balance	699	914
Total
Beginning Balance	1,860	255,824
Cash receipts (Payments)	41,582	(236,878)
Less: Impact on Revenue	40,921	18,960
Other	0	1,874
Ending Balance	$ 2,521	$ 1,860