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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Mar. 31, 2023
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 13,767 $ 14,687
Less accumulated depreciation 11,705 11,628
Property and equipment, net before construction work in progress 2,062 3,059
Construction in process 0 547
Property and equipment, net 2,062 3,606
Network sites and equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 11,287 12,292
Network sites and equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Network sites and equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Computer software    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 863 847
Computer software | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 1 year  
Computer software | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 7 years  
Computer equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 318 279
Computer equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Computer equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 7 years  
Furniture and fixture and other equipment    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 480 450
Furniture and fixture and other equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 2 years  
Furniture and fixture and other equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful life 5 years  
Leasehold improvements    
Property, Plant and Equipment [Line Items]    
Estimated useful life 10 years  
Property and equipment, gross $ 819 $ 819