Equity Method Investments - Summarized unaudited financial data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Summary financial information of equity method investments
Current assets	$ 246,538	$ 188,968
Current liabilities	200,178	42,657
Net revenues	37,577		$ 32,409
Operating loss	5,066		4,066
Net loss	$ 33,381		$ (9,543)
Equity Method Investment, Nonconsolidated Investee or Group of Investees
Summary financial information of equity method investments
Current assets		15,741
Non-current assets		30,854
Current liabilities		59,221
Non-current liabilities		4,156
Net revenues		3,041
Operating loss		(2,796)
Net loss		$ (2,234)