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Nature of Operations (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended 9 Months Ended
Jul. 31, 2019
USD ($)
$ / shares
shares
Sep. 30, 2019
USD ($)
item
Dec. 31, 2019
USD ($)
item
Sep. 15, 2014
$ / shares
Conversion of Stock [Line Items]        
Percentage of channels in its portion of the 900 MHz band     60.00%  
Number of carriers | item   2    
Metropolitan market areas | item     20  
Sale of stock | shares 2,222,223      
Sale of stock, price per share | $ / shares $ 45.00      
Net proceeds from July 2019 follow-on offering $ 94,200   $ 94,244  
Underwriting discounts 5,500      
Offering expenses $ 300      
TeamConnect LLC [Member]        
Conversion of Stock [Line Items]        
Metropolitan market areas | item     7  
Investment recorded   $ 14 $ 48  
PDV Spectrum Holding Company, LLC [Member] | Common Class B Units [Member]        
Conversion of Stock [Line Items]        
Sale of stock, price per share | $ / shares       $ 20.00