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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 6 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Statement of Cash Flows [Abstract]    
Net loss $ (4,526) $ (5,227)
Adjustment to reconcile net loss to net cash:    
Depreciation and amortization 313 332
Common stock-based compensation and expenses, net 907 1,776
Other non-cash items (52) 45
Accounts receivables, net (30) (65)
Inventory 15 (202)
Deposits and advances 76 534
Claims and advances 5 (13)
Accounts payable 19 (524)
Accrued and other liabilities 185 (535)
Operating lease asset 63 63
Operating lease liability (61) (66)
Net cash used in operating activities (3,086) (3,882)
Cash flow from investing activities:    
Purchase of property, plant, and equipment (55) 277
Sale of property, plant, and equipment 42 0
Investment in short term investments 128 (193)
Acquisition and filing cost of patents and rights (48) (60)
Net cash provided by investing activities 67 24
Cash flows from financing activities:    
Net proceeds from the issuance of common stock 2,860 103
Repayment of long-term loan (2) (2)
Net cash provided by financing activities 2,858 101
Effects of exchange rate changes on cash and cash equivalents (9) (80)
Net decrease in cash and cash equivalents (170) (3,837)
Cash and cash equivalents at the beginning of the period 3,196 10,460
Cash and cash equivalents at the end of the period 3,026 6,623
Non-cash items:    
Common stock issued/granted for stock-based compensation, including patent acquisition $ 907 $ 1,776