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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