Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Income Tax Contingency [Line Items]
Statutory tax rate based on blended rate calculation	35.00%	21.00%	21.00%	24.30%
(Reductions) additions to valuation allowance		$ (2,167,000)	$ 131,000
Operating loss carryforwards, annual utilization limits		$ 800,000
Operating loss carryforwards, utilization limit, percent		80.00%
Unrecognized tax benefits that would impact effective tax rate		$ 500,000
Net expense (benefit) for interest and penalties		4,000	100,000	$ (2,000,000.0)
Cumulative accrual for potential interest and penalties		$ 800,000	800,000
Maximum
Income Tax Contingency [Line Items]
Number of years open for tax examinations		5 years
Minimum
Income Tax Contingency [Line Items]
Number of years open for tax examinations		3 years
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards		$ 13,800,000
Net operating loss carryforwards with indefinite carryforward period			74,100,000
Foreign Tax Authority
Income Tax Contingency [Line Items]
Net operating loss carryforwards		0
State Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforwards		21,600,000
SoLayTec
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations			$ (1,300,000)
Tempress
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations		(11,100,000)
R2D
Income Tax Contingency [Line Items]
Income tax expense (benefit) from discontinued operations		$ 200,000