Investments and Fair Value Measurements - Investment Category and Length (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 30, 2022 USD ($) company	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) company
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	$ 10,881		$ 10,881		$ 12,151
Gross unrealized (loss), in loss position less than twelve months	(306)		(306)		(61)
Fair value, in loss position greater than twelve months	1,000		1,000		2,013
Gross unrealized (loss), in loss position greater than twelve months	(3)		(3)		(4)
Fair value, total in loss position	11,881		11,881		14,164
Gross unrealized (loss), total in loss position	(309)		(309)		(65)
Restricted Cash
Restricted cash	3,900		3,900
Minority Investments
Investments, equity method	13,082		$ 13,082		$ 10,166
Number of equity method investments | company			5		5
Impairment charge	0	$ 0	$ 0	$ 0
Bank Of Beijing
Restricted Cash
Maximum borrowing capacity	3,400		3,400
Bank Of Beijing | Secured debt
Restricted Cash
Time deposit	3,900		3,900
Certificates of deposit.
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	6,059		6,059		$ 6,181
Gross unrealized (loss), in loss position less than twelve months	(141)		(141)		(19)
Fair value, total in loss position	6,059		6,059		6,181
Gross unrealized (loss), total in loss position	(141)		(141)		(19)
Corporate bonds
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months	4,822		4,822		5,970
Gross unrealized (loss), in loss position less than twelve months	(165)		(165)		(42)
Fair value, in loss position greater than twelve months	1,000		1,000		2,013
Gross unrealized (loss), in loss position greater than twelve months	(3)		(3)		(4)
Fair value, total in loss position	5,822		5,822		7,983
Gross unrealized (loss), total in loss position	(168)		(168)		(46)
Other assets
Minority Investments
Investments, equity method	$ 13,100		$ 13,100		$ 10,200