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Segment Information and Major Customers Geographic revenue (Details) $ in Thousands			3 Months Ended												12 Months Ended
	Sep. 30, 2019 customer	Sep. 30, 2018 customer	Sep. 30, 2019 USD ($) customer	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Sep. 30, 2018 USD ($) customer		Jun. 30, 2018 USD ($)	[1]	Mar. 31, 2018 USD ($)	[1]	Dec. 31, 2017 USD ($)	[1]	Sep. 30, 2019 USD ($) customer	Sep. 30, 2018 USD ($) customer		Sep. 30, 2017 USD ($) customer
Segment Reporting Information [Line Items]
Revenue | $			$ 64,960	$ 61,166	$ 65,764	$ 62,313	$ 65,118	[1]	$ 62,272		$ 54,548		$ 44,955		$ 254,203	$ 226,893	[1]	$ 181,340	[1]
Number of customer representing over ten percent of revenue															0	0		0
Number of customer representing over ten percent of consolidated accounts receivable	1	1	1				1								1	1
Accounts Receivable
Segment Reporting Information [Line Items]
Percentage of concentration	14.70%	12.20%
United States | U.S. Export Net Sales
Segment Reporting Information [Line Items]
Percentage of concentration															28.50%	30.10%		37.20%
[1] Prior period information has been restated for the adoption of ASU No. 2014-09, “Revenue from Contracts with Customers (Topic 606)”, which we adopted on October 1, 2018.

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