Income Taxes - Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Deferred income	$ 3,252	$ 1,891
Fair market value adjustment	10,856	0
Other	758	149
Tax loss carryforwards	28,358	32,487
Deferred tax assets, gross	43,224	34,527
Valuation allowance	(43,224)	(34,527)
Deferred tax assets, net of valuation allowance	0	0
Net deferred income taxes	$ 0	$ 0