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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Operating activities:    
Net income (loss) $ 1,187 $ (307)
Adjustments to reconcile net income to net cash (used for) provided by operating activities:    
Depreciation of property, equipment and improvements 1,553 1,089
Amortization of intangible assets 6,309 3,961
Stock-based compensation 2,017 1,745
Deferred income tax provision 1,732 750
Change in fair value of contingent consideration 0 5,772
Provision for bad debt and product returns 414 (518)
Provision for inventory obsolescence 600 600
Restructuring charge 109 733
Other 25 118
Changes in operating assets and liabilities (net of acquisitions) (23,831) (5,631)
Net cash (used for) provided by operating activities (9,885) 8,312
Investing activities:    
Acquisition of business, net of cash acquired (347,593) 0
Purchase of property, equipment, improvements and certain other intangible assets (454) (777)
Net cash used in investing activities (348,047) (777)
Financing activities:    
Proceeds from long-term debt 350,000 0
Payments on long-term debt (95,799) (15,625)
Proceeds from stock option plan transactions 4,227 3,944
Proceeds from employee stock purchase plan transactions 321 334
Purchases of common stock (6,025) (1,446)
Net cash provided by (used for) financing activities 252,724 (12,793)
Effect of exchange rate changes on cash and cash equivalents (36) 392
Net increase (decrease) in cash and cash equivalents (105,244) (4,866)
Cash and cash equivalents, beginning of period 152,432 54,129
Cash and cash equivalents, end of period 47,188 49,263
Supplemental schedule of non-cash investing and financing activities    
Transfer of inventory to property, equipment and improvements (699) (882)
Tenant improvement allowance 0 1,000
Accrual for purchase of property, equipment, improvements and certain other intangible assets $ (16) $ (452)