CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net loss	$ (9,480)	$ (11,705)
Adjustments to reconcile net loss to net cash used in operating activities:
Deferred income tax expense (benefit)	(55)	34
Rental equipment depreciation	2,247	3,308
Property, plant and equipment depreciation	1,095	1,313
Accretion of discounts on short-term investments	13	16
Stock-based compensation expense	826	1,375
Bad debt expense (recovery)	350	(482)
Inventory obsolescence expense	1,434	4,147
Gross profit from sale of used rental equipment	(2,566)	(1,201)
Realized loss on short-term investments		1
Effects of changes in operating assets and liabilities:
Trade accounts receivable	2,562	2,312
Income tax receivable	10
Inventories	(2,865)	(1,507)
Prepaid expenses and other current assets	(329)	(39)
Prepaid income taxes	41	393
Accounts payable trade	723	(348)
Accrued expenses and other	267	(257)
Deferred revenue	(65)	771
Income tax payable		(31)
Net cash used in operating activities	(5,792)	(1,900)
Cash flows from investing activities:
Purchase of property, plant and equipment	(218)	(106)
Proceeds from the sale of used rental equipment	997	1,915
Purchases of short-term investments	(1,905)
Proceeds from the sale of short-term investments	5,898	2,674
Net cash provided by investing activities	4,772	4,483
Cash flows from financing activities:
Proceeds from the exercise of stock options		50
Net cash provided by financing activities		50
Effect of exchange rate changes on cash	(149)	(101)
Increase (decrease) in cash and cash equivalents	(1,169)	2,532
Cash and cash equivalents, beginning of fiscal year	15,092	10,262
Cash and cash equivalents, end of fiscal period	$ 13,923	$ 12,794