CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Revenue:
Products	$ 9,517	$ 11,845	$ 18,600	$ 22,304
Revenue, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 16,390	$ 14,278	$ 33,005	$ 21,694
Total revenue	25,907	26,123	51,605	43,998
Cost of revenue:
Products	$ 9,722	$ 11,246	$ 19,625	$ 22,459
Revenue, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 8,280	$ 4,526	$ 13,585	$ 8,098
Total cost of revenue	18,002	15,772	33,210	30,557
Gross profit	7,905	10,351	18,395	13,441
Operating expenses:
Selling, general and administrative	6,066	5,358	12,063	11,443
Research and development	4,225	3,898	8,521	7,069
Change in estimated fair value of contingent consideration	972		972
Bad debt expense (recovery)	8,124	73	8,151	(30)
Total operating expenses	19,387	9,329	29,707	18,482
Income (loss) from operations	(11,482)	1,022	(11,312)	(5,041)
Other income (expense):
Interest expense	(11)	(23)	(23)	(57)
Interest income	216	180	350	452
Foreign exchange gains (losses), net	108	119	(24)	186
Other, net	(28)	(41)	(57)	(129)
Total other income (expense), net	285	235	246	452
Income (loss) before income taxes	(11,197)	1,257	(11,066)	(4,589)
Income tax expense	607	550	2,027	557
Net income (loss)	$ (11,804)	$ 707	$ (13,093)	$ (5,146)
Income (loss) per common share:
Basic	$ (0.87)	$ 0.05	$ (0.97)	$ (0.38)
Diluted	$ (0.87)	$ 0.05	$ (0.97)	$ (0.38)
Weighted average common shares outstanding:
Basic	13,541,404	13,401,135	13,503,486	13,369,932
Diluted	13,541,404	13,557,185	13,503,486	13,369,932