Income Taxes - Income (Loss) Before Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Domestic	$ (33,991)	$ (40,963)	$ (1,723)
Foreign	3,218	(20,051)	6,281
(LOSS) INCOME BEFORE INCOME TAX (BENEFIT) EXPENSE	$ (30,773)	$ (61,014)	$ 4,558