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Summary of Significant Accounting Policies - Comparison of Reported Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Property and equipment, gross	$ 16,088	$ 14,646
Less accumulated depreciation	13,379	11,082
Property and equipment, net before construction work in progress	2,709	3,564
Construction in process	240	10
Assets held for future use		0
Property and equipment, net	2,949	3,574
Network sites and equipment
Property and equipment, gross	14,588	13,235
Property and equipment, net		0	$ 0
Computer software
Property and equipment, gross	639	592
Computer equipment
Property and equipment, gross	204	293
Furniture and fixture and other equipment
Property and equipment, gross	415	284
Leasehold improvements
Property and equipment, gross	$ 242	242
As Originally Reported
Property and equipment, gross		13,958
Less accumulated depreciation		11,082
Property and equipment, net before construction work in progress		2,876
Construction in process		10
Assets held for future use		688
Property and equipment, net		3,574
As Originally Reported | Network sites and equipment
Property and equipment, gross		12,547
As Originally Reported | Computer software
Property and equipment, gross		592
As Originally Reported | Computer equipment
Property and equipment, gross		293
As Originally Reported | Furniture and fixture and other equipment
Property and equipment, gross		284
As Originally Reported | Leasehold improvements
Property and equipment, gross		242
Impact of Prior Period Errors
Property and equipment, gross		688
Less accumulated depreciation		0
Property and equipment, net before construction work in progress		688
Construction in process		0
Assets held for future use		(688)
Property and equipment, net		0
Impact of Prior Period Errors | Network sites and equipment
Property and equipment, gross		688
Impact of Prior Period Errors | Computer software
Property and equipment, gross		0
Impact of Prior Period Errors | Computer equipment
Property and equipment, gross		0
Impact of Prior Period Errors | Furniture and fixture and other equipment
Property and equipment, gross		0
Impact of Prior Period Errors | Leasehold improvements
Property and equipment, gross		$ 0

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