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Fair Value of Financial Instruments - Additional Information (Details) - Tremont Realty Capital LLC - USD ($) $ in Thousands | 1 Months Ended |  |
--- | --- | --- | ---
Aug. 31, 2016 | Dec. 31, 2017 | Sep. 30, 2017
Business Acquisition [Line Items] |  |  |
Cash consideration | $ 2,466 |  |
Contingent consideration | $ 1,270 | $ 142 | $ 591
Duration of potential earn out | 2 years |  |

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