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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
12 Months Ended
Dec. 31, 2021
USD ($)
Installment
segment
Dec. 31, 2021
EUR (€)
Installment
segment
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Summary Of Significant Accounting Policies [Line Items]        
Unbilled receivable $ 127.6   $ 110.9  
Allowance for doubtful accounts 0.2   0.1  
Gain (loss) on foreign currency translation $ (0.3)   $ 2.4 $ (0.9)
Threshold percentage for disclosure of revenue and receivables 10.00% 10.00% 10.00% 10.00%
Advertising Expense $ 38.9   $ 25.5 $ 31.1
Number of business segments | segment 1 1    
401 (K) Plan        
Summary Of Significant Accounting Policies [Line Items]        
Employee contribution limit as a percentage of their eligible compensation 100.00% 100.00%    
Percentage of employer contribution matched of the first employee pay 100.00% 100.00%    
Maximum employee contribution limit as a percentage of their total taxable earnings 5.00% 5.00%    
Employer contribution $ 14.6   14.7 14.8
Defined Contribution Plan        
Summary Of Significant Accounting Policies [Line Items]        
Maximum employee contribution limit as a percentage of their total taxable earnings 40.00% 40.00%    
Employer contribution $ 5.2   $ 4.4 $ 4.1
Per employee contribution limit | €   € 115,000    
Maximum percentage of employer contribution matched of employee's 18.00% 18.00%    
Time-Based Stock Options        
Summary Of Significant Accounting Policies [Line Items]        
Expiration period 10 years 10 years    
Number of equal annual installments for stock vested | Installment 4 4    
Time-Based Stock Options | Non-employee Directors        
Summary Of Significant Accounting Policies [Line Items]        
Expiration period 10 years 10 years    
Vesting period 1 year 1 year    
Time-Based RSUs        
Summary Of Significant Accounting Policies [Line Items]        
Number of equal annual installments for stock vested | Installment 4 4    
Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Manufacturing Process period 10 days 10 days    
Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Manufacturing Process period 56 days 56 days    
Manufacturing and royalty revenues | Minimum        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms in number of days 30 days 30 days    
Manufacturing and royalty revenues | Maximum        
Summary Of Significant Accounting Policies [Line Items]        
Payment terms in number of days 90 days 90 days    
VUMERITY | Biogen        
Summary Of Significant Accounting Policies [Line Items]        
Consideration expects to receive 2022 2022    
VUMERITY | Other Assets | Biogen        
Summary Of Significant Accounting Policies [Line Items]        
Contract assets, noncurrent $ 5.0