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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Operating Activities:    
Net loss $ (3,507) $ (1,305)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 643 639
Amortization of debt issuance costs 5 5
Warranty provision 24 4
Inventory obsolescence 46 26
Stock-based compensation 420 558
Deferred income taxes 0  
Amortization of operating lease right of use asset 199 178
Accretion of acquisition holdback liability 12 12
Changes in operating assets and liabilities:    
Accounts receivable, net 3,482 889
Inventories, net (2,041) (2,752)
Prepaid expenses and other 624 253
Accounts payable 249 99
Accrued and other liabilities (5,006) (1,743)
Net cash used in operating activities (4,850) (2,702)
Investing Activities:    
Purchases of marketable securities (1,994) (2,655)
Proceeds from maturities of marketable securities 1,609 2,886
Capital expenditures (98) (159)
Net cash (used in) provided by investing activities (483) 72
Financing Activities:    
Proceeds from exercise of stock options 32 46
Repurchase of common stock 0  
Net cash provided by (used in) financing activities 32 (395)
Effect of foreign exchange rate on cash 39 (11)
Net decrease in cash, cash equivalents, and restricted cash (5,262) (3,036)
Cash, cash equivalents and restricted cash, beginning of period 13,659 14,528
Cash, cash equivalents and restricted cash, end of period 8,397 11,492
Cash and cash equivalents 7,563 10,136
Restricted cash, current portion 738 273
Long-term restricted cash 96 1,083
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 8,397 11,492
Noncash investing and financing activities:    
Change in unrealized loss on marketable securities 21 (10)
Obligation to issue common stock in connection with the Amika Mobile asset purchase (416) (832)
Initial measurement of operating lease right of use assets 0 7
Initial measurement of operating lease liabilities $ 0 $ 7