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Consolidated Statements of Cash Flows - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Operating Activities:    
Net income $ 11,874 $ 2,785
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 800 825
Provision for doubtful accounts 4 (23)
Warranty provision 16 85
Inventory obsolescence 407 128
Unrealized loss on foreign currency forward contract 76
Share-based compensation 980 735
Deferred income taxes (5,708) 570
Amortization of operating lease right of use asset 599
Changes in operating assets and liabilities:    
Accounts receivable, net (1,775) (855)
Inventories, net (521) 771
Prepaid expenses and other 927 1,359
Accounts payable 477 (2,095)
Accrued and other liabilities (1,238) 5,570
Net cash provided by operating activities 6,918 9,855
Investing Activities:    
Purchases of marketable securities (8,056) (4,495)
Proceeds from maturities of marketable securities 5,061 4,228
Capital expenditures (140) (343)
Net cash used in investing activities (3,135) (610)
Financing Activities:    
Proceeds from exercise of stock options 1,136 703
Repurchase of common stock (398) (2,171)
Shares retained for payment of taxes in connection with settlement of restricted stock units (42)
Payments on promissory notes (17) (17)
Net cash provided by (used in) financing activities 679 (1,485)
Effect of foreign exchange rate on cash 17 (49)
Net increase in cash, cash equivalents and restricted cash 4,479 7,711
Cash, cash equivalents and restricted cash, beginning of period 19,517 11,806
Cash, cash equivalents and restricted cash, end of period 23,996 19,517
Cash and cash equivalents 23,319 18,819
Restricted cash, current portion 282 263
Long-term restricted cash 395 435
Total cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows 23,996 11,806
Supplemental disclosures of cash flow information:    
Interest paid 3
Noncash investing and financing activities:    
Change in unrealized gain (loss) on marketable securities (4) 20
Initial measurement of operating lease ROU assets 5,824
Initial measurement of operating lease liabilities $ 7,815