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Property and Equipment
 12 Months Ended
Mar. 31, 2022
Property, Plant and Equipment [Abstract]  
Property and Equipment Property and Equipment 
Property and equipment consists of the following at March 31, 2022 and 2021 (in thousands):
Estimated
useful life		20222021
Network sites and equipment
5-10 years
$14,588 $13,235 
Computer software
1-7 years
639 592 
Computer equipment
5-7 years
204 293 
Furniture and fixture and other equipment
2-5 years
415 284 
Leasehold improvements
Shorter of the lease term or 10 years
242 242 
16,088 14,646 
Less accumulated depreciation13,379 11,082 
2,709 3,564 
Construction in process240 10 
Property and equipment, net$2,949 $3,574 
Depreciation expense for the years ended March 31, 2022, 2021 and 2020 amounted to approximately $1.5 million, $3.5 million and $3.6 million, respectively.
During the years ending March 31, 2021 and 2020, the Company recorded $85,000 and $46,000, respectively, of non-cash impairment charges for network sites and equipment to reduce the carrying values to zero. There were no impairment charges during the year ended March 31, 2022.