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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Operating Activities:    
Net loss $ (6,910) $ (1,797)
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 1,282 1,282
Amortization of debt issuance costs 8 10
Warranty provision 52 16
Inventory obsolescence 90 64
Stock-based compensation 933 1,295
Deferred income taxes 0 (336)
Amortization of operating lease right of use asset 385 360
Accretion of acquisition holdback liability 24 24
Changes in operating assets and liabilities:    
Accounts receivable, net 3,158 2,123
Inventories, net (3,469) (3,291)
Prepaid expenses and other 1,840 253
Accounts payable 1,145 805
Accrued and other liabilities (6,004) (4,412)
Net cash used in operating activities (7,466) (3,107)
Investing Activities:    
Purchases of marketable securities (3,641) (3,656)
Proceeds from maturities of marketable securities 4,716 3,681
Capital expenditures (157) (171)
Net cash provided by (used in) investing activities 918 (146)
Financing Activities:    
Proceeds from exercise of stock options 86 170
Repurchase of common stock 0 (998)
Shares retained for payment of taxes in connection with settlement of restricted stock units (45) (70)
Payments on promissory notes 0 (17)
Net cash provided by (used in) financing activities 41 (915)
Effect of foreign exchange rate on cash 54 (20)
Net decrease in cash, cash equivalents, and restricted cash (6,453) (4,188)
Cash, cash equivalents and restricted cash, beginning of period 13,659 14,528
Cash, cash equivalents and restricted cash, end of period 7,206 10,340
Cash and cash equivalents 6,371 8,977
Restricted cash, current portion 739 267
Long-term restricted cash 96 1,096
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 7,206 10,340
Noncash investing and financing activities:    
Change in unrealized loss on marketable securities 50 (69)
Obligation to issue common stock in connection with the Amika Mobile asset purchase (416) (832)
Initial measurement of operating lease right of use assets 79 7
Initial measurement of operating lease liabilities $ 79 $ 7