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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Cash Flows From Operating Activities        
Net loss $ (3,604) $ (3,264) $ (11,626) $ (9,800)
Adjustments to reconcile net loss to net cash used in operating activities:        
(Gain) loss on investment in equity securities 0 48 (12) 123
Accretion on investments     (128) (104)
Depreciation and amortization     209 234
Stock-based compensation 157 544 1,307 1,877
Increase (decrease) in cash resulting from changes in:        
Accounts receivable     119 (76)
Prepaid expenses and other assets     132 18
Accounts payable     140 (173)
Accrued expenses     (2,121) 157
Operating lease right-of-use assets and liabilities, net     (2) 69
Net cash used in operating activities     (11,982) (7,675)
Cash Flows From Investing Activities        
Purchases of fixed assets     (42) (234)
Purchases of investments     (9,873) (9,893)
Maturities of investments     10,000 10,000
Purchases of equity securities     0 (1,061)
Sales of equity securities     0 384
Liquidation of equity securities     718 0
Net cash provided by (used in) investing activities     803 (804)
Cash Flows From Financing Activities        
Proceeds from issuance of common stock, net     1,173 0
Net cash provided by financing activities     1,173 0
Net decrease in cash, cash equivalents, and restricted cash     (10,006) (8,479)
Cash, cash equivalents, and restricted cash at beginning of period     15,444 28,818
Cash, cash equivalents, and restricted cash at end of period 5,438 20,339 5,438 20,339
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets        
Cash and cash equivalents 5,295 20,196 5,295 20,196
Restricted cash 143 143 143 143
Cash, cash equivalents, and restricted cash at end of period $ 5,438 $ 20,339 5,438 20,339
Supplemental Disclosure of Cash Flow Information:        
Income taxes paid     $ 2 $ 2