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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property and equipment    
Property and equipment, gross $ 63,148 $ 56,943
Less: accumulated depreciation (33,089) (28,726)
Property and equipment, net excluding equipment installations in progress 30,059 28,217
Total property and equipment, net 31,554 31,798
Depreciation expense 4,400 4,700
Equipment purchased 2,100 900
Reimbursement received 2,600 1,200
Land and Improvements    
Property and equipment    
Property and equipment, gross 8,724 8,724
Building    
Property and equipment    
Property and equipment, gross 11,325 11,325
Equipment    
Property and equipment    
Property and equipment, gross 41,842 35,637
Towers    
Property and equipment    
Property and equipment, gross 1,257 1,257
Equipment installations in progress    
Property and equipment    
Total property and equipment, net $ 1,495 $ 3,581