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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
CASH FLOWS FROM OPERATING ACTIVITIES        
Net income (loss) $ 328 $ (8,020) $ 283 $ (31,859)
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities        
Depreciation and amortization     653 1,107
Non-cash compensation expense attributable to stock awards     12,024 13,411
Deferred income taxes     892 613
Gain on disposal of intangible assets, net (13,737) (5,776) (33,035) (9,329)
Gain on sale of intangible assets, net (32) 0 (7,364) 0
Loss on disposal of long-lived assets, net 3 (21) 39 1
Changes in operating assets and liabilities        
Prepaid expenses and other assets     322 666
Right of use assets     (1,258) 480
Accounts payable and accrued expenses     1,588 43
Due to related parties     (533) 0
Operating lease liabilities     941 (747)
Contingent liability     15,000 249
Deferred revenue     46,301 6,689
Net cash provided by (used in) operating activities     35,853 (18,676)
CASH FLOWS FROM INVESTING ACTIVITIES        
Purchases of intangible assets, including refundable deposits     (14,809) (19,069)
Proceeds from sale of spectrum     25,427 0
Purchases of equipment     (267) (1,543)
Net cash provided by (used in) investing activities     10,351 (20,612)
CASH FLOWS FROM FINANCING ACTIVITIES        
Proceeds from stock option exercises     7 872
Repurchase of common stock     (18,706) (8,223)
Payments of withholding tax on net issuance of restricted stock     (1,137) (1,474)
Net cash used in financing activities     (19,836) (8,825)
Net change in cash and cash equivalents and restricted cash     26,368 (48,113)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH        
Cash and cash equivalents and restricted cash at beginning of the period     43,182 105,624
Cash and cash equivalents and restricted cash at end of the period 69,550 57,511 69,550 57,511
Cash paid during the period:        
Taxes paid     1 12
Non-cash investing activity:        
Network equipment provided in exchange for wireless licenses     616 30
Deferred gain on sale of intangible assets 4,911 0 4,911 0
Derecognition of contingent liability related to sale of intangible assets     19,249 0
Reconciliation of Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents 62,033 57,511 62,033 57,511
Escrow deposits 7,517 0 7,517 0
Total cash and cash equivalents and restricted cash $ 69,550 $ 57,511 $ 69,550 $ 57,511