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Stock-Based Compensation (Stock Options) - Additional Information (Detail) - Stock Options [Member] - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option contractual term   10 years  
Recognized compensation expenses $ 1   $ 6
Maximum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options maximum vesting period   5 years