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Income Taxes - Rollforward of Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Roll forward of valuation allowance:      
BALANCE AT BEGINNING OF THE YEAR $ 60,003    
BALANCE AT END OF THE YEAR 46,938 $ 60,003  
Valuation Allowance of Deferred Tax Assets      
Roll forward of valuation allowance:      
BALANCE AT BEGINNING OF THE YEAR 60,003 55,666 $ 61,756
CHARGED (CREDITED) TO EXPENSE (8,337) 6,211 3,568
OTHER INCREASES/ (DECREASES) (4,728) (1,874) (9,658)
BALANCE AT END OF THE YEAR $ 46,938 $ 60,003 $ 55,666