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Summary of Adjustments to Uncertain Tax Position (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]      
Beginning Balance   $ 238 $ 238
Increase/Decrease for tax positions related to the current year $ 0 0 0
Increase/Decrease for tax positions related to prior years 0 0 0
Decrease for settlements with applicable taxing authorities 0 0 0
Decrease for previous year's lapses of statute of limitations   (20)  
Decrease for impact of §382 limitations   (218)  
Decrease for lapses of statute of limitations $ 0 $ 0 0
Ending Balance     $ 238