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Supplemental Disclosure of Cash Flow Information (Details)
$ in Thousands
 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2022
country
Mar. 31, 2022
county
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Supplemental Cash Flow Elements [Abstract]          
Taxes paid $ 7     $ 61 $ 36
Interest paid 0     0 0
Non-cash investing activity:          
Capitalized change in estimated asset retirement obligations (17)     85 557
Contribution of patent to TeamConnect LLC 0     0 34
Contribution of capital equipment to TeamConnect LLC 0     0 14
Network equipment provided in exchange for wireless licenses 120     61 21
Non-cash activity:          
Shares surrendered from stock option exercises 1,000     0 0
Equity payment of prior year accrued employee related expenses 0     1,537 0
Broadband licenses granted, number of countries   21 21    
Gain (loss) from disposal of intangible assets, net $ 11,209     $ (3,849) $ (88)