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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2017 | Sep. 30, 2016
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax benefit | $ (769) | $ (539) | $ (605) | $ (201) | $ 1,604 | $ (518) | $ (225) | $ 77 | $ (2,114) | $ 938
U.S. |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses | 31,500 |  |  |  |  |  |  |  | 31,500 |
State |  |  |  |  |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses | $ 1,800 |  |  |  |  |  |  |  | $ 1,800 |

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