Leases - Schedule of Maturities of Operating Lease Liabilities (Details) $ in Thousands	Sep. 30, 2019 USD ($)
Property Plant And Equipment [Abstract]
2019 (excluding the nine months ended September 30, 2019)	$ 2,395
2020	9,507
2021	8,925
2022	9,318
2023	8,769
Thereafter	23,620
Total lease payments	62,534
Imputed interest	(13,525)
Lease liabilities	49,009
Tenant improvement reimbursements included in the measurement of lease liabilities but not yet received	(1,113)
Lease liabilities, net	$ 47,896