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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating Loss Carryforwards [Line Items]        
Benefit for income taxes $ (22,226) $ (26,632) $ (30,747) $ (25,381)
Percentage of pre-tax loss     33.00% 42.00%
State and Local Jurisdiction [Member]        
Operating Loss Carryforwards [Line Items]        
Valuation allowance for deferred assets associated with state NOL carryforwards $ 9,000   $ 9,000