Investments - Accounting Method, Carrying Value and Underlying Equity in Net Assets of Unconsolidated Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Long-term Investments [Abstract]
Equity method investments, carrying value	$ 263	$ 426
Variable interest entity, equity method, carrying value	816	1,060
Equity securities	4,226	14,136
Equity securities with no readily determinable fair value	5,408	35
Warrants and options	16	74
Total carrying value of investments	10,729	15,731
Equity method Investments, underlying equity in net assets	3,577	2,252
Variable interest entity, equity method, underlying equity in net assets	$ 3,043	$ 9