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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Cash Flows From Operating Activities    
Net loss $ (14,671) $ (17,259)
Adjustments to reconcile net loss to net cash used in operating activities:    
Gain on investment in equity securities (12) (29)
Loss on disposal of fixed assets 0 9
Accretion on investments (142) (105)
Depreciation and amortization 280 293
Stock-based compensation 1,508 2,377
Increase (decrease) in cash resulting from changes in:    
Accounts receivable 119 (152)
Inventory (297) 0
Prepaid expenses and other assets 392 177
Accounts payable 296 (148)
Accrued expenses (2,121) 2,359
Operating right-of-use asset and lease liability, net (5) 70
Net cash used in operating activities (14,653) (12,408)
Cash Flows From Investing Activities    
Purchases of fixed assets (42) (396)
Purchases of investments (10,860) (9,893)
Maturities of investments 11,000 10,000
Purchases of equity securities 0 (1,061)
Proceeds from sales of equity securities 0 384
Liquidation of equity securities 718 0
Net cash provided by (used in) investing activities 816 (966)
Cash Flows From Financing Activities    
Proceeds from issuance of common stock, net 1,437 0
Net cash provided by financing activities 1,437 0
Net Decrease in Cash, Cash Equivalents, and Restricted Cash (12,400) (13,374)
Cash, cash equivalents, and restricted cash at beginning of period 15,444 28,818
Cash, cash equivalents, and restricted cash at end of period 3,044 15,444
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets    
Cash and cash equivalents 2,901 15,301
Restricted cash 143 143
Cash, cash equivalents, and restricted cash at end of period 3,044 15,444
Supplemental Disclosure of Cash Flow Information:    
Income taxes paid 2 2
Purchases of fixed assets in accounts payable $ 0 $ 64