Discontinued Operations and Disposals - Operating Results of Discontinued Operations (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net loss	$ (11,151)	$ (665)	$ (11,816)	$ (8,297)
Tempress and SoLayTec | Discontinued Operations, Held-for-sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues, net of returns and allowances			7,442	25,139
Cost of sales			5,969	23,669
Gross profit			1,473	1,470
Selling, general and administrative			1,814	8,857
Research, development and engineering			540	3,039
Restructuring charges			37	567
Operating loss			(918)	(10,993)
(Loss) gain on sale of subsidiary			(10,916)	1,614
Interest expense and other, net			(29)	(121)
Loss from discontinued operations before income taxes			(11,863)	(9,500)
Income benefit			(47)	(1,203)
Net loss			$ (11,816)	$ (8,297)