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Prepaid Expenses and Other Assets, Current - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Income Tax Contingency [Line Items]      
Decrease to prepaid facility and manufacturing   $ 2.0  
Increase in Other Receivables   10.5 $ 8.4
Proceeds from license fees received $ 1.5    
Capitalized implementation costs   $ 1.7