CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Cash flows from operating activities:
Net loss	$ (8,234)	$ (13,093)
Adjustments to reconcile net loss to net cash provided (used in) by operating activities:
Deferred income tax benefit	(1)	(34)
Rental equipment depreciation	7,772	9,269
Property, plant and equipment depreciation	1,970	2,057
Amortization of intangible assets	866	866
Accretion of discounts on short-term investments	3
Stock-based compensation expense	1,027	1,123
Bad debt expense	8	158
Inventory obsolescence expense	1,155	1,966
Change in estimate of collectability of rental revenue		7,993
Change in estimated fair value of contingent consideration	(918)	972
Gross profit from sale of used rental equipment	(4,150)	(425)
Loss (gain) on disposal of property, plant and equipment	6	(153)
Gain on transfer of investment in security	(269)
Effects of changes in operating assets and liabilities:
Trade accounts and notes receivables	190	(771)
Unbilled receivables	(2,707)
Inventories	(6,652)	1,760
Deferred cost of revenue and other assets	6,525	(8,440)
Accounts payable trade	3,629	871
Deferred revenue and other liabilities	(4,153)	1,607
Net cash provided by (used in) operating activities	(3,933)	5,726
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,673)	(2,785)
Proceeds from the sale of property, plant and equipment	2	180
Investment in rental equipment	(59)	(5,238)
Proceeds from the sale of used rental equipment	9,991	2,100
Purchases of short-term investments	(3,800)
Proceeds from investment security transaction	269
Net cash provided by (used in) investing activities	4,730	(5,743)
Cash flows from financing activities:
Purchase of treasury stock	(2,328)
Net cash used in financing activities	(2,328)
Effect of exchange rate changes on cash	91	1
Decrease in cash and cash equivalents	(1,440)	(16)
Cash and cash equivalents, beginning of fiscal year	32,686	18,925
Cash and cash equivalents, end of fiscal period	31,246	18,909
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest		23
Cash paid for income taxes	70	2,074
Inventory transferred to (from) rental equipment	$ (504)	$ 6,126