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Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Cash Flows From Operating Activities    
Net loss $ (4,028) $ (3,215)
Adjustments to reconcile net loss to net cash used in operating activities:    
(Gain) loss on investment in equity securities (12) 5
Accretion on investments (60) (10)
Depreciation and amortization 67 50
Stock-based compensation 475 660
Increase (decrease) in cash resulting from changes in:    
Accounts receivable 3 0
Prepaid expenses and other assets 149 194
Accounts payable 157 (285)
Accrued expenses (2,061) 181
Operating lease right-of-use assets and liabilities, net (1) 6
Net cash used in operating activities (5,311) (2,414)
Cash Flows From Investing Activities    
Purchases of fixed assets (15) (74)
Purchases of investments (4,939) (9,891)
Maturities of investments 5,000 0
Purchases of equity securities 0 (728)
Liquidation of equity securities 718 0
Net cash provided by (used in) investing activities 764 (10,693)
Cash Flows From Financing Activities    
Net cash provided by financing activities 0 0
Net decrease in cash, cash equivalents, and restricted cash (4,547) (13,107)
Cash, cash equivalents, and restricted cash at beginning of period 15,444 28,818
Cash, cash equivalents, and restricted cash at end of period 10,897 15,711
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets    
Cash and cash equivalents 10,754 15,568
Restricted cash 143 143
Cash, cash equivalents, and restricted cash at end of period 10,897 15,711
Supplemental Disclosure of Cash Flow Information:    
Income taxes paid $ 2 $ 2