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Leases - Additional Information (Details)
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Schedule Of Operating And Finance Leased Assets [Line Items]          
Area of land | ft² 30,000        
Lease expiration date Apr. 30, 2028        
Operating lease, expense   $ 400,000 $ 100,000 $ 800,000 $ 400,000
Operating lease, payments       $ 500,000  
Minimum          
Schedule Of Operating And Finance Leased Assets [Line Items]          
Lessee, operating lease, renewal term   3 years   3 years  
Lessee, finance lease, renewal term   3 years   3 years  
Maximum          
Schedule Of Operating And Finance Leased Assets [Line Items]          
Lessee, operating lease, renewal term   5 years   5 years  
Lessee, finance lease, renewal term   5 years   5 years  
Tenant improvement allowance $ 1,000,000.0        
Letter of Credit          
Schedule Of Operating And Finance Leased Assets [Line Items]          
Letter of credit $ 1,500,000