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Leases - Additional Information (Detail)
 9 Months Ended
Sep. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
ft²
Sep. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Lessee Lease Description [Line Items]        
Operating lease liabilities $ 10,268,000 $ 0    
Operating lease right-of-use assets $ 9,959,000 0    
Operating lease, description The Company leases facilities and certain equipment under noncancelable operating leases with remaining lease terms of 0.6 year to 6.3 years, one of which includes an option to extend the lease for one five-year term.      
Operating lease, option to extend true      
Operating lease, options to extend one of which includes an option to extend the lease for one five-year term.      
Operating lease, renewal term 5 years      
weighted average remaining lease term 4 years 8 months 12 days      
Weighted average discount rate 8.00%      
Restricted cash $ 4,787,000 $ 4,826,000 $ 3,111,000 $ 2,475,000
Corporate Office Space Lease Agreement        
Lessee Lease Description [Line Items]        
Operating leases arrangement term   10 years 9 months    
Corporate Office Space Lease Agreement | Letter of Credit        
Lessee Lease Description [Line Items]        
Restricted cash $ 2,200,000      
California | Corporate Office Space Lease Agreement        
Lessee Lease Description [Line Items]        
Office space leases in square feet | ft²   67,020    
Minimum lease payment amount   $ 53,700,000    
Lease commencement period first half of fiscal year 2020      
Minimum [Member]        
Lessee Lease Description [Line Items]        
Operating lease remaining lease term 7 months 6 days      
Maximum        
Lessee Lease Description [Line Items]        
Operating lease remaining lease term 6 years 3 months 18 days