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Property and Equipment - Narrative (Details) - USD ($)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Property, Plant and Equipment [Line Items]      
Depreciation $ 1,400,000 $ 1,500,000 $ 3,500,000
Impairment of long-lived assets 0 0 85,000
Property and equipment, net $ 3,606,000 $ 2,949,000  
Network sites and equipment      
Property, Plant and Equipment [Line Items]      
Property and equipment, net     $ 0