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Commitments and Contingencies - Additional Information (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2018
USD ($)
Installment
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Other Commitments [Line Items]          
Operating lease rent expense   $ 4.8 $ 2.7 $ 13.4 $ 6.9
Outstanding liability   0.9   0.9  
Selling, General and Administrative          
Other Commitments [Line Items]          
Estimated fair value of grant expense $ 1.7        
Fair value of grant, discount rate 10.00%        
Endowment Agreement          
Other Commitments [Line Items]          
Donation fund $ 2.0        
Annual installment payment of donation fund $ 0.5        
Number of annual installments | Installment 4        
Other Accrued and Current Liabilities          
Other Commitments [Line Items]          
Deferred rent, current   0.8   0.8  
Outstanding liability   0.4   0.4  
Other Noncurrent Liabilities          
Other Commitments [Line Items]          
Deferred rent, noncurrent   6.8   6.8  
Outstanding liability   $ 0.5   $ 0.5  
Minimum [Member]          
Other Commitments [Line Items]          
Operating lease term   1 year   1 year  
Maximum          
Other Commitments [Line Items]          
Operating lease term   11 years   11 years