INCOME TAXES - Deferred tax assets (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Deferred tax assets:
Net operating loss and capital loss carryforwards and credits	$ 78,428	$ 113,561
Compensation expense for share-based awards	383	497
Fixed assets and intangibles	0	677
Basis of investments in affiliates	18	254
Accrued liabilities and other	1,495	432
Lease liability	726	330
State taxes	0	15
Total deferred tax assets	81,050	115,766
Valuation allowance	(40,585)	(76,969)
Total deferred tax assets, net of valuation allowance	40,465	38,797
Deferred tax liabilities:
ROU Asset	(726)	(330)
Fixed assets and intangibles	(2,572)	0
Unrealized gain on investments held at fair value	(55,696)	(38,374)
Other	(23)	(93)
Total deferred tax liabilities	(59,017)	(38,797)
Net deferred tax liabilities	$ (18,552)	$ 0