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Condensed Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Jun. 30, 2022 | Jun. 30, 2021
Cash flows from operating activities |  |
Net income | $ 32,370 | $ 12,901
Adjustments to reconcile net income to net cash (used in) provided by operating activities: |  |
Depreciation and amortization | 2,174 | 1,725
Change in allowance for doubtful accounts | 0 | 210
Stock-based compensation | 1,647 | 966
Changes in operating assets and liabilities: |  |
Accounts receivable | (12,156) | (5,896)
Inventories, net | (41,816) | (6,571)
Other assets | (185) | (261)
Accounts payable and accrued expenses | 8,677 | 5,043
Net cash (used in) provided by operating activities | (9,289) | 8,117
Cash flows from investing activities |  |
Purchases of property, plant and equipment and intangible assets | (6,764) | (1,275)
Purchases of investments | (248) | (11,904)
Proceeds from sales and maturities of investments | 17,386 | 10,044
Net cash provided by (used in) investing activities | 10,374 | (3,135)
Cash flows from financing activities |  |
Proceeds from issuance of common stock under employee stock purchase plan | 544 | 383
Repurchase of shares for payment of withholding taxes for vested restricted stock grants | (274) | (54)
Withholding related to exercise of stock options | (379) | (456)
Net cash used in financing activities | (109) | (127)
Increase in cash and cash equivalents | 976 | 4,855
Cash and cash equivalents, beginning of period | 13,216 | 16,450
Cash and cash equivalents, end of period | 14,192 | 21,305
Supplemental disclosures for cash flow information |  |
Cash paid during the year for income taxes | 9,913 | 3,560
Non-cash financing activities |  |
Cashless exercise of stock options | $ 276 | $ 1,269

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- Definition Amount of expense (reversal of expense) for expected credit loss on accounts receivable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(5)) -URI https://asc.fasb.org/extlink&oid=126953954&loc=SL114868664-224227 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 + Details
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