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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Property and equipment    
Property and equipment, gross $ 56,943 $ 60,108
Less: accumulated depreciation (28,726) (28,241)
Property and equipment, net excluding equipment installations in progress 28,217 31,867
Total property and equipment, net 31,798 34,319
Depreciation expense 4,700 3,300
Equipment purchased 900 700
Reimbursement received 1,200 1,700
Land and improvements    
Property and equipment    
Property and equipment, gross 8,724 8,724
Building    
Property and equipment    
Property and equipment, gross 11,325 11,530
Equipment    
Property and equipment    
Property and equipment, gross 35,637 38,318
Towers    
Property and equipment    
Property and equipment, gross 1,257 1,536
Equipment installations in progress    
Property and equipment    
Total property and equipment, net $ 3,581 $ 2,452