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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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