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Property and Equipment - Components of Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 14,687 $ 16,088  
Less accumulated depreciation 11,628 13,379  
Property and equipment, net before construction work in progress 3,059 2,709  
Construction in process 547 240  
Property and equipment, net 3,606 2,949  
Network sites and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 12,292 14,588  
Property and equipment, net     $ 0
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 $ 847 639  
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 $ 279 204  
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 $ 450 415  
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 $ 242