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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Cash flows from operating activities:    
Net loss $ (11,506) $ (15,016)
Adjustment to reconcile net loss to net cash:    
Depreciation and amortization 657 651
Provision for bad debt 126 1,718
Permanent impairment of PPE 0 833
Impairment of non-marketable securities 0 49
Common stock-based compensation and expenses, net 2,843 2,197
Net loss on sale of property, plant, and equipment 39 0
Forgiveness of PPP Loan 0 (430)
Changes in:    
Accounts receivables, net 5 50
Inventory 897 1,930
Deposits and advances 591 541
Claims and advances (150) (334)
Accounts payable (451) 504
Accrued and other liabilities (88) (129)
Operating lease asset 124 38
Operating lease liability (134) (64)
Net cash used in operating activities (7,047) (7,462)
Cash flow from investing activities:    
Purchase of property, plant, and equipment (310) (236)
Sale of property, plant, and equipment 538 29
Investment in short-term investments (154) 0
Acquisition and filing cost of patents and rights (309) (535)
Net cash used in investing activities (235) (742)
Cash flows from financing activities:    
Net proceeds from the issuance of common stock 103 4,145
Repayment of long-term loan (3) (3)
Net cash provided by financing activities 100 4,142
Effects of exchange rate changes on cash and cash equivalents (82) (26)
Net decrease in cash and cash equivalents (7,264) (4,088)
Cash and cash equivalents at the beginning of the period 10,460 14,548
Cash and cash equivalents at the end of the period 3,196 10,460
Non-cash items:    
Common stock issued/granted for stock-based compensation, including patent acquisition 2,842 2,197
Forgiveness of PPP Loan $ 0 $ (430)