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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Cash Flows From Operating Activities    
Net loss $ (2,488) $ (14,671)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on investment in equity securities 0 (12)
Gain on sale of asset (10,000) 0
Accretion on investments (38) (142)
Depreciation and amortization 266 280
Stock-based compensation 532 1,508
Non-cash lease expense 432 406
Inventory write-off 798 0
Increase (decrease) in cash resulting from changes in:    
Accounts receivable 3 119
Inventory (501) (297)
Prepaid expenses and other assets 253 392
Accounts payable 1,017 296
Accrued expenses 717 (2,121)
Operating lease liability (452) (411)
Net cash used in operating activities (9,461) (14,653)
Cash Flows From Investing Activities    
Purchases of fixed assets (13) (42)
Proceeds from sale of asset 9,000 0
Purchases of investments (2,962) (10,860)
Maturities of investments 3,000 11,000
Liquidation of equity securities 0 718
Net cash provided by investing activities 9,025 816
Cash Flows From Financing Activities    
Proceeds from issuance of common stock, net 8,847 1,437
Net cash provided by financing activities 8,847 1,437
Net Increase (Decrease) in Cash, Cash Equivalents, and Restricted Cash 8,411 (12,400)
Cash, cash equivalents, and restricted cash at beginning of period 3,044 15,444
Cash, cash equivalents, and restricted cash at end of period 11,455 3,044
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets    
Cash and cash equivalents 11,312 2,901
Restricted cash 143 143
Cash, cash equivalents, and restricted cash at end of period 11,455 3,044
Supplemental Disclosure of Cash Flow Information:    
Escrow receivable 1,000
Income taxes paid 2 2
Interest paid 10
Liability to be settled in equity 218
Financed insurance premium exchanged for prepaid insurance $ 128