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Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Cash Flows From Operating Activities            
Net loss $ (3,604) $ (3,264) $ (11,626) $ (9,800) $ (17,259) $ (11,448)
Adjustments to reconcile net loss to net cash used in operating activities:            
(Gain) loss on investment in equity securities 0 48 (12) 123 (29) 0
Loss on disposal of fixed assets         9 0
Accretion on investments     (128) (104) (105) 0
Depreciation and amortization     209 234 293 142
Stock-based compensation 157 544 1,307 1,877 2,377 2,256
Increase (decrease) in cash resulting from changes in:            
Accounts receivable     119 (76) (152) 0
Prepaid expenses and other assets     132 18 177 384
Accounts payable     140 (173) (148) 134
Accrued expenses     (2,121) 157 2,359 49
Operating right-of-use asset and lease liability, net     (2) 69 70 30
Net cash used in operating activities     (11,982) (7,675) (12,408) (8,453)
Cash Flows From Investing Activities            
Purchases of fixed assets     (42) (234) (396) (409)
Purchases of investments     (9,873) (9,893) (9,893) 0
Maturities of investments     10,000 10,000 10,000 0
Purchases of equity securities     0 (1,061) (1,061) 0
Sales of equity securities     0 384    
Liquidation of equity securities     718 0 384 0
Net cash used in investing activities     803 (804) (966) (409)
Cash Flows From Financing Activities            
Proceeds from issuance of common stock, net     1,173 0 0 251
Employee taxes paid related to net share settlement of equity awards         0 (46)
Net cash provided by financing activities     1,173 0 0 205
Net Decrease in Cash, Cash Equivalents, and Restricted Cash     (10,006) (8,479) (13,374) (8,657)
Cash, cash equivalents, and restricted cash at beginning of period     15,444 28,818 28,818 37,475
Cash, cash equivalents, and restricted cash at end of period 5,438 20,339 5,438 20,339 15,444 28,818
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets            
Cash and cash equivalents 5,295 20,196 5,295 20,196 15,301 28,675
Restricted cash 143 143 143 143 143 143
Cash, cash equivalents, and restricted cash at end of period $ 5,438 $ 20,339 5,438 20,339 15,444 28,818
Supplemental Disclosure of Cash Flow Information:            
Income taxes paid     $ 2 $ 2 2 2
Operating lease liabilities arising from obtaining right-of-use assets         0 2,301
Purchases of fixed assets in accounts payable         $ 64 $ 0