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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Operating Activities:    
Net loss $ (18,396) $ (16,212)
Adjustments to reconcile net income to net cash (used in) provided by operating activities:    
Impairment of goodwill 0 13,162
Depreciation and amortization 2,558 2,556
Amortization of debt issuance costs 8 19
Provision for doubtful accounts 0 55
Warranty provision 31 86
Inventory obsolescence 295 333
Stock-based compensation 1,642 2,227
Deferred income taxes 7,373 666
Loss on disposal of fixed asset (4) (0)
Amortization of operating lease right of use asset 772 746
Accretion of acquisition holdback liability 49 48
Changes in operating assets and liabilities:    
Accounts receivable, net 827 836
Inventories, net (788) 75
Prepaid expenses and other 1,671 242
Accounts payable 425 199
Accrued and other liabilities (6,064) (4,570)
Net cash provided by operating activities (9,593) 468
Investing Activities:    
Purchases of marketable securities (3,641) (6,830)
Proceeds from maturities of marketable securities 9,418 7,122
Capital expenditures (239) (381)
Net cash provided by (used in) investing activities 5,538 (89)
Financing Activities:    
Proceeds from exercise of stock options 138 282
Repurchase of common stock 0 (998)
Shares retained for payment of taxes in connection with settlement of restricted stock units (45) (70)
Shares retained for payment of taxes in connection with the exercise of stock options 207 (0)
Payments on promissory notes 0 (277)
Net cash used in financing activities (114) (1,063)
Effect of foreign exchange rate on cash 29 (185)
Net decrease in cash, cash equivalents, and restricted cash (4,140) (869)
Cash, cash equivalents and restricted cash, beginning of period 13,659 14,528
Cash, cash equivalents and restricted cash, end of period 9,519 13,659
Cash and cash equivalents 8,665 12,736
Restricted cash, current portion 758 100
Long-term restricted cash 96 823
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 9,519 13,659
Noncash investing and financing activities:    
Change in unrealized loss on marketable securities 80 (90)
Obligation to issue common stock in connection with the Amika Mobile asset purchase (416) (832)
Initial measurement of operating lease right of use assets 79 466
Initial measurement of operating lease liabilities 79 466
Shares surrendered from stock option exercises $ 300 $ 0