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Leases - Additional Information (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Sep. 30, 2018
Lessee, Lease, Description [Line Items]      
Lease expense included in selling, general and administrative expenses $ 0.4 $ 1.2 $ 1.1
Weighted average remaining lease term for operating leases 6 years 11 months 20 days 6 years 11 months 20 days  
Weighted average discount rate for operating lease (as percent) 6.30% 6.30%  
Cash payments for operating lease expense $ 0.6 $ 1.8  
Minimum      
Lessee, Lease, Description [Line Items]      
Remaining lease term   2 years  
Maximum      
Lessee, Lease, Description [Line Items]      
Remaining lease term   8 years