CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue:
Products	$ 12,153	$ 13,270	$ 34,457	$ 40,454
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 10,720	$ 8,000	$ 32,414	$ 14,707
Total revenue	22,873	21,270	66,871	55,161
Cost of revenue:
Products	$ 10,508	$ 12,956	$ 32,967	$ 40,117
Type of Revenue [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 4,775	$ 3,637	$ 12,873	$ 9,336
Total cost of revenue	15,283	16,593	45,840	49,453
Gross profit	7,590	4,677	21,031	5,708
Operating expenses:
Selling, general and administrative	6,050	4,551	17,493	14,465
Research and development	4,246	2,537	11,315	8,125
Bad debt expense	629	2,725	599	3,081
Total operating expenses	10,925	9,813	29,407	25,671
Loss from operations	(3,335)	(5,136)	(8,376)	(19,963)
Other income (expense):
Interest expense	(28)	(94)	(85)	(285)
Interest income	446	257	898	799
Foreign exchange gains (losses), net	(1)	264	185	(85)
Other, net	(54)	(34)	(183)	(88)
Total other income, net	363	393	815	341
Loss before income taxes	(2,972)	(4,743)	(7,561)	(19,622)
Income tax expense (benefit)	700	53	1,257	(617)
Net loss	$ (3,672)	$ (4,796)	$ (8,818)	$ (19,005)
Loss per common share:
Basic	$ (0.27)	$ (0.36)	$ (0.66)	$ (1.43)
Diluted	$ (0.27)	$ (0.36)	$ (0.66)	$ (1.43)
Weighted average common shares outstanding:
Basic	13,405,504	13,266,316	13,381,789	13,244,242
Diluted	13,405,504	13,266,316	13,381,789	13,244,242