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Leases - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Mar. 31, 2021
hub
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2018
hub
Lessee, Lease, Description [Line Items]              
Operating lease expense $ 927   $ 991 $ 1,904 $ 2,253    
Short-term lease costs 58   62 115 123    
Sublease income 33   33 67 67    
Finance lease term             5 years
Number of satellite hubs leased | hub             3
Number of satellite hubs disposed | hub   2          
Finance lease, gross cost 117,683     117,683   $ 114,265  
Finance lease, accumulated depreciation 58,581     $ 58,581   $ 57,992  
Leased assets, useful life       5 years      
Capital asset depreciation expense 46   46 $ 91 91    
Net investment in lease, current 3,924     3,924      
Net investment in lease, noncurrent 7,186     7,186      
Sales-type lease, interest income $ 221   $ 203 $ 452 $ 400    
Lessor, operating lease, term of contract 3 years     3 years      
Lessor, operating lease, gross costs $ 672     $ 672      
Lessor, operating lease, accumulated depreciation 45     $ 45      
Lessor, operating lease, useful life       5 years      
Depreciation expense 31     $ 45      
Lease revenue 49     73      
Assets Held Under Finance Leases              
Lessee, Lease, Description [Line Items]              
Finance lease, gross cost 1,268     1,268      
Finance lease, accumulated depreciation $ 619     $ 619      
Leased assets, useful life       7 years      
Minimum              
Lessee, Lease, Description [Line Items]              
Sales-type leases, term of contracts 3 years     3 years      
Maximum              
Lessee, Lease, Description [Line Items]              
Sales-type leases, term of contracts 5 years     5 years