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Revenue - Narrative (Details)
people in Millions
 1 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
people
Feb. 28, 2021
people
Dec. 31, 2020
USD ($)
people
Mar. 31, 2022
USD ($)
item
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Sep. 30, 2014
USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Number of people | people   3.6 7.5        
Lease term     30 years        
Lease extension 10 years   10 years        
Scheduled prepayments     $ 47,700,000        
Contractual term     30 years 30 years      
Revenue recognized       $ 1,084,000 $ 729,000    
Days after agreement execution, payments due 30 days            
Prepaid expenses and other current assets       $ 10,147,000 3,508,000    
Number of carriers       2   2  
Accrued sales commission       $ 300,000 400,000    
Direct cost of revenue (exclusive of depreciation and amortization)       5,000 1,606,000 $ 2,833,000  
Sales and support       4,461,000 2,942,000 4,055,000  
Spectrum revenue              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Revenue recognized       $ 729,000 $ 729,000 729,000  
Prepaid expenses and other current assets             $ 7,500,000
Maximum              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Lease term 40 years   40 years        
Lease extension       10 years      
Contractual term       10 years      
Ameren              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Lease term       30 years      
Revenue recognized       $ 400,000      
Evergy              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Number of people | people 3.9            
Lease term 20 years            
Scheduled prepayments $ 30,200,000            
Tier 1 Carrier Partner              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Number of carriers       1 1    
Goosetown And A BEEP              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Direct cost of revenue (exclusive of depreciation and amortization)           200,000  
Sales and support           $ 300,000  
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-03-31              
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]              
Service revenue payment terms       30 days