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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
U.S. capital loss carryforward | $ 5,500 |  |  |  |  |  | $ 5,500 |  |
Valuation allowance | 5,952 |  |  | $ 5,970 |  |  | 5,952 | $ 5,970 |
Net tax benefits | 200 | $ 700 | $ 100 | 200 | $ 500 | $ 700 | 1,000 | 1,500 | $ 800
Accrued income tax penalties and interest for unrecognized tax benefits | 100 |  |  | $ 200 |  |  | 100 | $ 200 |
Accumulated undistributed foreign earnings | 34,600 |  |  |  |  |  | 34,600 |  |
Maximum |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Estimated unrecognized deferred tax liability | 600 |  |  |  |  |  | 600 |  |
United States Federal Tax Jurisdiction |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Federal and state research and development tax credits | 2,000 |  |  |  |  |  | 2,000 |  |
U.S. capital loss carryforward | 5,100 |  |  |  |  |  | 5,100 |  |
Foreign Tax Authority |  |  |  |  |  |  |  |  |
Tax Credit Carryforward [Line Items] |  |  |  |  |  |  |  |  |
Non-U.S. operating losses | $ 400 |  |  |  |  |  | $ 400 |  |

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