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Stock-Based Compensation Expense (Detail)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
May 14, 2015
USD ($)
shares
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Installment
$ / shares
shares
Sep. 30, 2015
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of stock options granted (in shares) | shares       383,375 83,750
Aggregate grant date fair value       $ 500 $ 1,100
Number of vesting period anniversaries | Installment       4  
Vesting stock based compensation related to awards   $ 735 $ 12,304 $ 2,403 $ 20,047
Unrecognized stock-based compensation expense   $ 4,100   $ 4,100  
Weighted average remaining life for recognition of unrecognized compensation expense       2 years 7 months 30 days  
Stock options exercised during period (in shares) | shares       0 0
Share-based Compensation Award, Tranche One          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of vesting period anniversaries | Installment       2  
Award vesting percentage       30.00%  
Share-based Compensation Award, Tranche Two          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of vesting period anniversaries | Installment       2  
Award vesting percentage       20.00%  
Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price (USD per share) | $ / shares       $ 2.48  
Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Exercise price (USD per share) | $ / shares       $ 34.72  
Non-Employee Directors | Class A common stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares granted (in shares) | shares 30,365        
Aggregate grant fair value $ 600        
Vesting term 1 year