Quarterly report pursuant to Section 13 or 15(d)

Leases - Additional Information (Detail)

v3.19.3
Leases - Additional Information (Detail)
$ in Thousands
1 Months Ended
Jan. 31, 2019
USD ($)
ft²
Sep. 30, 2019
USD ($)
Jan. 01, 2019
USD ($)
Dec. 31, 2018
USD ($)
Lessee Lease Description [Line Items]        
Lessee, operating leases remaining lease term.   7 years 1 month 6 days    
Lessee, finance leases remaining lease term.   1 year    
Area of land of additional facility lease agreement | ft² 57,000      
Lease expiration period 2028-08      
Operating lease right-of-use-asset $ 7,200 $ 10,397 $ 4,180 $ 0
Operating lease, lease liability 7,200 11,536    
Asset retirement obligation   $ 400    
Letter of Credit        
Lessee Lease Description [Line Items]        
Letter of credit $ 3,000      
Minimum        
Lessee Lease Description [Line Items]        
Lessee, operating leases remaining lease term.   3 years    
Lessee, finance leases remaining lease term.   1 year    
Lessee, operating leases renewal lease term   1 year    
Maximum        
Lessee Lease Description [Line Items]        
Lessee, operating leases remaining lease term.   9 years    
Lessee, finance leases remaining lease term.   2 years    
Lessee, operating leases renewal lease term   5 years