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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Statement of Cash Flows [Abstract]    
Net loss $ (2,075) $ (2,785)
Adjustment to reconcile net loss to net cash:    
Depreciation and amortization 155 162
Common stock-based compensation and expenses, net 357 1,152
Other non-cash items (53) 68
Changes in:    
Accounts receivables, net (118) (23)
Inventory 10 (74)
Deposits and advances 33 73
Claims and advances (13) 15
Accounts payable 142 (524)
Accrued and other liabilities 91 (258)
Operating lease asset 31 31
Operating lease liability (28) (33)
Net cash used in operating activities (1,468) (2,196)
Cash flow from investing activities:    
Purchase of property, plant, and equipment (20) (127)
Sale of property, plant, and equipment 43 0
Acquisition and filing cost of patents and rights (28) (31)
Net cash used in investing activities (5) (158)
Cash flows from financing activities:    
Net proceeds from the issuance of common stock 0 0
Repayment of long-term loan (1) (1)
Net cash used in financing activities (1) (1)
Effects of exchange rate changes on cash and cash equivalents 1 (52)
Net decrease in cash and cash equivalents (1,473) (2,407)
Cash and cash equivalents at the beginning of the period 3,196 10,460
Cash and cash equivalents at the end of the period 1,723 8,053
Non-cash items:    
Common stock issued/granted for stock-based compensation, including patent acquisition $ 357 $ 1,152