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Income Taxes - Changes in Valuation Allowance (Details) - Valuation Allowance of Deferred Tax Assets - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]    
Balance at beginning-of-year $ 89,723 $ 50,519
Charged to costs and expenses 9,856 47,142
Charged (credited) to other accounts 1,766  
Charged (credited) to other accounts   (7,938)
Balance at end-of-year 101,345 89,723
Valuation allowance increase (decrease) charged to additional paid-in capital $ 1,800 (8,600)
Valuation allowance increase (decrease) charged to retained earnings   $ 700