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Leases - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Lessor and Lessee Lease Description [Line Items]        
Operating lease, option to extend, existence     true  
Operating lease, option to terminate, existence     true  
Short-term lease cost $ 6 $ 100 $ 20 $ 300
Variable lease cost 100 $ 300 400 $ 700
Operating lease payments, option to extend $ 300   $ 300  
Minimum [Member]        
Lessor and Lessee Lease Description [Line Items]        
Operating lease, remaining lease terms 1 month   1 month  
Operating lease, options to terminate term     3 months  
Maximum [Member]        
Lessor and Lessee Lease Description [Line Items]        
Operating lease, remaining lease terms 5 years   5 years  
Operating lease, renewal term 9 years   9 years  
Lessor sales-type lease arrangement terms for network equipment 5 years   5 years