CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Revenue:
Products	$ 11,845	$ 13,910	$ 22,304	$ 27,184
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 14,278	$ 5,337	$ 21,694	$ 6,707
Total revenue	26,123	19,247	43,998	33,891
Cost of revenue:
Products	$ 11,246	$ 14,065	$ 22,459	$ 27,161
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 4,526	$ 3,183	$ 8,098	$ 5,699
Total cost of revenue	15,772	17,248	30,557	32,860
Gross profit	10,351	1,999	13,441	1,031
Operating expenses:
Selling, general and administrative	5,358	4,785	11,443	9,914
Research and development	3,898	2,430	7,069	5,588
Bad debt expense (recovery)	73	6	(30)	356
Total operating expenses	9,329	7,221	18,482	15,858
Income (loss) from operations	1,022	(5,222)	(5,041)	(14,827)
Other income (expense):
Interest expense	(23)	(127)	(57)	(191)
Interest income	180	279	452	542
Foreign exchange gains (losses), net	119	(306)	186	(349)
Other, net	(41)	(29)	(129)	(54)
Total other income (expense), net	235	(183)	452	(52)
Income (loss) before income taxes	1,257	(5,405)	(4,589)	(14,879)
Income tax expense (benefit)	550	(676)	557	(670)
Net income (loss)	$ 707	$ (4,729)	$ (5,146)	$ (14,209)
Income (loss) per common share:
Basic	$ 0.05	$ (0.36)	$ (0.38)	$ (1.07)
Diluted	$ 0.05	$ (0.36)	$ (0.38)	$ (1.07)
Weighted average common shares outstanding:
Basic	13,401,135	13,264,710	13,369,932	13,233,205
Diluted	13,557,185	13,264,710	13,369,932	13,233,205