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Stock Based Compensation (Stock Option Activity) (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Total Number of Shares, outstanding Beginning Balance 561 663  
Stock options activity, Total Number of Shares, Granted 105 146  
Stock options activity, Total Number of Shares, Exercised 0 (8)  
Stock options activity, Total Number of Shares, Cancelled (161) (240)  
Total Number of Shares, outstanding Ending Balance 505 561 663
Total Number of Shares, exercisable 300 329  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]      
Stock options activity, Weighted Average Exercise Price, Beginning balance $ 41.50 $ 51.60  
Stock options activity, Weighted Average Exercise Price, Granted 1.30 9.40  
Stock options activity, Weighted Average Exercise Price, Exercised 0.00 31.44  
Stock options activity, Weighted Average Exercise Price, Cancelled 34.21 50.28  
Stock options activity, Weighted Average Exercise Price, Ending balance 35.49 41.50 $ 51.60
Stock options activity, Weighted Average Exercise Price, exercisable $ 54.15 $ 56.06  
Stock options activity, Aggregate Intrinsic Value, Beginning balance $ 0 $ 539 $ 610
Stock options activity, Aggregate Intrinsic Value, Granted 0    
Stock options activity, Aggregate Intrinsic Value, Exercised 0    
Stock options activity, Aggregate Intrinsic Value, Cancelled 0    
Stock options activity, Aggregate Intrinsic Value, Ending balance 0 $ 0 $ 539
Stock options activity, Aggregate Intrinsic Value, exercisable $ 0