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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Statement of Cash Flows [Abstract]    
Net loss $ (5,227) $ (6,132)
Adjustment to reconcile net loss to net cash:    
Depreciation and amortization 332 320
Provision for bad debt 0 1,718
Impairment of non-marketable securities 0 37
Common stock-based compensation and expenses, net 1,776 549
Net loss on sale of fixed asset 45 0
Forgiveness of PPP Loan 0 (430)
Changes in:    
Accounts receivables, net (65) 36
Inventory (202) (20)
Deposits and advances 534 (150)
Claims and advances (13) (8)
Accounts payable (524) (56)
Accrued and other liabilities (535) 6
Operating lease asset 63 (22)
Operating lease liability (66) (1)
Net cash used in operating activities (3,882) (4,153)
Cash flow from investing activities:    
Net purchase of property, plant, and equipment 277 (125)
Investment in short term investments (193) 0
Acquisition and filing cost of patents and rights (60) (15)
Net cash provided by/(used in) investing activities 24 (140)
Cash flows from financing activities:    
Issuance of equity stock through offering (net of expenses) 103 4,145
Repayment of long-term loan (2) (1)
Net cash provided by financing activities 101 4,144
Effects of exchange rate changes on cash and cash equivalents (80) 0
Net decrease in cash and cash equivalents (3,837) (149)
Cash and cash equivalents at the beginning of the period 10,460 14,548
Cash and cash equivalents at the end of the period 6,623 14,399
Supplementary information:    
Cash paid for interest 0 0
Non-cash items:    
Common stock issued/granted for stock-based compensation, including patent acquisition 1,776 549
Forgiveness of PPP Loan 0 (430)
Amortization of operating lease $ 54 $ 53