Revision - Impact of Correction of Errors on Unaudited Consolidated Statement of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						6 Months Ended	9 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Revenue:
Products	$ 6,975	$ 9,517	$ 9,083	$ 12,153			$ 18,600	$ 25,575	$ 34,457
Revenue, Product and Service [Extensible List]	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember			us-gaap:ProductMember	us-gaap:ProductMember	us-gaap:ProductMember
Rental	$ 15,728	$ 16,390	$ 8,622	$ 10,720			$ 25,012	$ 40,740	$ 32,414
Total revenue	22,703	25,907	17,705	22,873			43,612	66,315	66,871
Cost of revenue	14,639	18,002	15,208	15,283			33,210	47,849	45,840
Gross profit	8,064	7,905	2,497	7,590			10,402	18,466	21,031
Operating expenses:
Selling, general and administrative	5,704	6,066		6,050			12,063	17,767	17,493
Research and development	4,014	4,225		4,246			8,521	12,535	11,315
Change in estimated fair value of contingent consideration	662	972					972	1,634
Bad debt expense	248	131		629			158	406	599
Total operating expenses	10,628	11,394	10,320	10,925			21,714	32,342	29,407
Loss from operations	(2,564)	(3,489)	(7,823)	(3,335)			(11,312)	(13,876)	(8,376)
Other income (expense), net	852	285	(39)	363			246	1,098	815
Loss before income taxes	(1,712)	(3,204)	(7,862)	(2,972)			(11,066)	(12,778)	(7,561)
Income tax expense	573	607	1,420	700			2,027	2,600	1,257
Net loss	$ (2,285)	$ (3,811)	$ (9,282)	$ (3,672)	$ 707	$ (5,853)	$ (13,093)	$ (15,378)	$ (8,818)
Loss per common share:
Basic	$ (0.17)	$ (0.28)	$ (0.69)	$ (0.27)			$ (0.97)	$ (1.14)	$ (0.66)
Diluted	$ (0.17)	$ (0.28)	$ (0.69)	$ (0.27)			$ (0.97)	$ (1.14)	$ (0.66)
As Reported
Revenue:
Products		$ 9,517	$ 9,083				$ 18,600
Revenue, Product and Service [Extensible List]		us-gaap:ProductMember	us-gaap:ProductMember				us-gaap:ProductMember
Rental		$ 16,390	$ 16,615				$ 33,005
Total revenue		25,907	25,698				51,605
Cost of revenue		18,002	15,208				33,210
Gross profit		7,905	10,490				18,395
Operating expenses:
Selling, general and administrative		6,066					12,063
Research and development		4,225					8,521
Change in estimated fair value of contingent consideration		972					972
Bad debt expense		8,124					8,151
Total operating expenses		19,387	10,320				29,707
Loss from operations		(11,482)	170				(11,312)
Other income (expense), net		285	(39)				246
Loss before income taxes		(11,197)	131				(11,066)
Income tax expense		607	1,420				2,027
Net loss		$ (11,804)	$ (1,289)				$ (13,093)
Loss per common share:
Basic		$ (0.87)	$ (0.10)				$ (0.97)
Diluted		$ (0.87)	$ (0.10)				$ (0.97)
Adjustment
Revenue:
Revenue, Product and Service [Extensible List]		us-gaap:ProductMember	us-gaap:ProductMember				us-gaap:ProductMember
Rental			$ (7,993)				$ (7,993)
Total revenue			(7,993)				(7,993)
Gross profit			(7,993)				(7,993)
Operating expenses:
Bad debt expense		$ (7,993)					(7,993)
Total operating expenses		(7,993)					$ (7,993)
Loss from operations		7,993	(7,993)
Loss before income taxes		7,993	(7,993)
Net loss		$ 7,993	$ (7,993)
Loss per common share:
Basic		$ 0.59	$ (0.59)
Diluted		$ 0.59	$ (0.59)