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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Cash Flows from Operating Activities        
Net loss $ (2,549) $ (3,994) $ (5,893) $ (8,022)
Adjustments to reconcile net loss to net cash used in operating activities:        
Gain on investment in equity securities 0 0 0 (12)
Accretion on investments     (33) (103)
Depreciation and amortization     138 138
Stock-based compensation 155 675 311 1,150
Increase (decrease) in cash resulting from changes in:        
Accounts receivable     4 97
Inventory     (503) 0
Prepaid expenses and other assets     255 371
Accounts payable     (208) 104
Accrued expenses     152 (2,182)
Operating lease right-of-use assets and liabilities, net     (8) (1)
Net cash used in operating activities     (5,625) (8,460)
Cash Flows from Investing Activities        
Purchases of fixed assets     (13) (42)
Purchases of investments     (2,467) (7,900)
Maturities of investments     2,500 8,000
Liquidation of equity securities     0 718
Net cash provided by investing activities     20 776
Cash Flows from Financing Activities        
Proceeds from issuance of common stock, net     5,878 0
Net cash provided by financing activities     5,878 0
Net increase (decrease) in cash, cash equivalents, and restricted cash     273 (7,684)
Cash, cash equivalents, and restricted cash at beginning of period     3,044 15,444
Cash, cash equivalents, and restricted cash at end of period 3,317 7,760 3,317 7,760
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets        
Cash and cash equivalents 3,174 7,617 3,174 7,617
Restricted cash 143 143 143 143
Cash, cash equivalents, and restricted cash at end of period $ 3,317 $ 7,760 3,317 7,760
Supplemental Disclosure of Cash Flow Information:        
Income taxes paid     2 2
Liability to be settled in equity     218 0
Financed insurance premium exchanged for prepaid insurance     $ 385 $ 0