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Segment Reporting - Schedule of Reconciliation of Revenue to Net Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total spectrum revenue $ 1,552 $ 1,551 $ 2,970 $ 3,076
Significant segment expenses and other segment items        
Depreciation and amortization     257 330
Gain on sale of intangible assets, net (11,469) 0 (12,430) 0
Interest income 379 585 821 1,279
Other income 0 9 0 25
Income tax expense 7,518 230 5,261 1,452
Net income (loss) 53,536 (12,766) 78,716 (28,290)
Reportable Segment        
Segment Reporting Information [Line Items]        
Total spectrum revenue 1,552 1,551 2,970 3,076
Significant segment expenses and other segment items        
Adjusted general and administrative 5,820 8,125 12,976 16,795
Adjusted sales and support 1,336 1,281 2,700 3,044
Adjusted product development 956 1,716 1,866 3,388
Depreciation and amortization 133 151 257 330
Gain on exchange of intangible assets, net (59,602) 0 (93,518) (93)
Gain on sale of intangible assets, net (11,469) 0 (12,430) 0
Interest income 379 585 821 1,279
Other income 0 9 0 25
Income tax expense 7,518 230 5,261 1,452
Other segment items 3,703 3,408 7,963 7,754
Net income (loss) $ 53,536 $ (12,766) $ 78,716 $ (28,290)