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Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended							12 Months Ended
	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Tax Credit Carryforward [Line Items]
U.S. capital loss carryforward	$ 3,500							$ 3,500
Valuation allowance	3,291				$ 5,952			3,291	$ 5,952
Net discrete tax expense (benefits)	(1,500)	$ 100	$ 200	$ 2,800	(200)	$ (700)	$ (100)	1,500	(1,000)	$ (1,500)
Income tax provision								1,487	125	3,212
Release of valuation allowance								1,317	0	$ 0
Release of valuation allowance related to sale of corporate headquarters								1,100
Accrued income tax penalties and interest for unrecognized tax benefits	100				$ 100			100	$ 100
Accumulated undistributed foreign earnings	4,000							4,000
United States Federal Tax Jurisdiction
Tax Credit Carryforward [Line Items]
Federal and state research and development tax credits	3,600							3,600
U.S. capital loss carryforward	3,200							3,200
Foreign Tax Authority
Tax Credit Carryforward [Line Items]
Non-U.S. operating losses	$ 300							300
ASU 2016-09
Tax Credit Carryforward [Line Items]
Tax deficiency from exercise of stock options								600
Tax Cuts and Jobs Act of 2017 [Member]
Tax Credit Carryforward [Line Items]
Income tax provision								3,000
Tax Cuts and Jobs Act of 2017, Remeasurement Of Deferred Tax [Member]
Tax Credit Carryforward [Line Items]
Income tax provision								2,700
Tax Cuts and Jobs Act of 2017, One Time Transition Tax For Foreign Subsidiaries [Member]
Tax Credit Carryforward [Line Items]
Income tax provision								$ 300

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