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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Cash flows from operating activities: |  |
Net loss | $ (1,050) | $ (9,282)
Adjustments to reconcile net loss to net cash provided (used in) by operating activities: |  |
Deferred income tax expense (benefit) | 6 | (25)
Rental equipment depreciation | 3,831 | 4,443
Property, plant and equipment depreciation | 985 | 930
Amortization of intangible assets | 433 | 433
Stock-based compensation expense | 548 | 590
Bad debt expense | 7 | 27
Inventory obsolescence expense | 617 | 1,436
Change in estimate of collectability of rental revenue |  | 7,993
Change in estimated fair value of contingent consideration | (697) |
Gross profit from sale of used rental equipment | (4,127) | (284)
Gain on disposal of property, plant and equipment |  | (14)
Effects of changes in operating assets and liabilities: |  |
Trade accounts and other receivables | 5,143 | (8,460)
Unbilled receivables | (4,263) |
Inventories | (2,065) | (3,126)
Deferred cost of revenue and other assets | (1,422) | (954)
Accounts payable trade | 4,053 | 2,284
Deferred revenue and other liabilities | 311 | 651
Net cash provided by (used in) operating activities | 2,310 | (3,358)
Cash flows from investing activities: |  |
Purchase of property, plant and equipment | (597) | (1,670)
Proceeds from the sale of property, plant and equipment |  | 40
Investment in rental equipment | (13) | (5,152)
Proceeds from the sale of used rental equipment | 112 | 1,146
Net cash used in investing activities | (498) | (5,636)
Cash flows from financing activities: |  |
Purchase of treasury stock | (828) |
Net cash used in financing activities | (828) |
Effect of exchange rate changes on cash | 49 | 210
Increase (decrease) in cash and cash equivalents | 1,033 | (8,784)
Cash and cash equivalents, beginning of fiscal year | 32,686 | 18,925
Cash and cash equivalents, end of fiscal period | 33,719 | 10,141
SUPPLEMENTAL CASH FLOW INFORMATION: |  |
Cash paid for interest |  | 12
Cash paid for income taxes | 40 | 1,440
Note receivable in connection with sale of used rental equipment | 9,868 |
Inventory transferred to (from) rental equipment | $ (667) | $ 4,070

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