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Organization and Operations - Additional Information (Detail) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Accounting Policies [Abstract] |  |
Increase in valuation allowance | $ 30,400 |
Reclassification from additional paid in capital to accumulative deficit due to change in policy | 452 |
Restricted cash | $ 5,106 | $ 321

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