Significant Equity Method Investments - Summary of Balance Sheet Information of Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investments And Joint Ventures [Abstract]
Current assets	$ 56,710	$ 63,048
Noncurrent assets	162,304	156,858
Total assets	219,014	219,906
Current liabilities	19,910	12,229
Noncurrent liabilities	683	432
Total liabilities	20,593	12,661
Equity interests	198,421	207,245
Total liabilities and equity	$ 219,014	$ 219,906