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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Benefit for income taxes | $ (2,761) | $ (3,671) | $ (4,043) | $ (8,521)
Percentage of pre-tax loss |  |  | 24.00% | 27.00%
State and Local Jurisdiction [Member] |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Portion of state NOL carryforwards, not able to be utilized before expiration | $ 7,800 |  | $ 7,800 |

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