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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
CASH FLOWS FROM OPERATING ACTIVITIES    
Net income (loss) $ 78,716 $ (28,290)
Adjustments to reconcile net income (loss) to net cash used in operating activities    
Depreciation and amortization 257 330
Stock compensation expense 6,579 7,754
Deferred income taxes (120) 1,389
Right of use assets 516 832
Gain on exchange of intangible assets, net (93,518) (93)
Gain on sale of intangible assets, net (12,430) 0
Loss from disposal of long-lived assets, net 29 0
Changes in operating assets and liabilities    
Non-trade receivable 2,926 0
Prepaid expenses and other assets 351 1,525
Accounts payable and other accrued expenses 2,112 (1,537)
Accrued severance and other related charges 432 0
Due to related parties (30) 0
Operating lease liabilities (660) (1,032)
Contingent liability 7,425 10,000
Deferred revenue 5,744 4,415
Other liabilities (65) (302)
Net cash used in operating activities (1,736) (5,009)
CASH FLOWS FROM INVESTING ACTIVITIES    
Purchases of intangible assets and other related costs (17,147) (10,904)
Proceeds from sale of spectrum 13,878 0
Purchases of equipment 0 (41)
Net cash used in investing activities (3,269) (10,945)
CASH FLOWS FROM FINANCING ACTIVITIES    
Proceeds from stock option exercises 157 1,960
Repurchases of common stock (990) (2,027)
Payments of withholding tax on net issuance of restricted stock (716) (1,366)
Net cash used in financing activities (1,549) (1,433)
Net change in cash and cash equivalents and restricted cash (6,554) (17,387)
CASH AND CASH EQUIVALENTS AND RESTRICTED CASH    
Cash and cash equivalents and restricted cash at beginning of the period 55,024 68,124
Cash and cash equivalents and restricted cash at end of the period 48,470 50,737
Cash paid during the period:    
Taxes paid, including excise tax 859 885
Operating leases paid 1,115 1,199
Non-cash investing activity:    
Capitalized change in estimated asset retirement obligations 63 0
Network equipment provided in exchange for wireless licenses 0 47
Derecognition of contingent liability related to sale of intangible assets 14,948 0
Right of use assets new leases 321 290
Right of use assets modifications and renewals $ 47 $ 1,097