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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jan. 02, 2016
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense   $ 9,731,000 $ 4,748,000 $ 25,289,000 $ 12,927,000  
Weighted average grant date fair value per share       $ 40.43 $ 23.32  
2014 Stock Option and Incentive Plan and 2016 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares reserved under option plans   8,094,060   8,094,060    
Common stock available for issuance under stock option plans   2,125,783   2,125,783    
2014 Stock Option Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Common stock shares annual increase added to plan 1,488,886          
2014 Stock Option Plan [Member] | Maximum [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Percentage of increase on issued and outstanding shares of Common stock           4.00%
Restricted Stock Awards [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units granted       32,500    
Stock-based compensation expense   $ 200,000   $ 400,000    
Restricted stock units vesting period       2 years    
Restricted Stock Awards [Member] | Restricted Stock Units Vest One Year Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units cliff vesting percentage       50.00%    
Restricted stock units vesting period month and year       2018-02    
Restricted Stock Awards [Member] | Restricted Stock Units Vest Two Year Anniversary [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Restricted stock units cliff vesting percentage       50.00%    
Restricted stock units vesting period month and year       2019-02    
Performance Shares [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted       449,208 74,039  
Total unrecognized stock-based compensation expense   $ 13,700,000   $ 13,700,000    
Number of shares outstanding and unvested stock options   678,252   678,252    
Performance-Based Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Stock-based compensation expense       $ 0 $ 0  
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Options granted       2,169,250    
Total unrecognized stock-based compensation expense   $ 90,200,000   $ 90,200,000    
Weighted average period of unrecognized compensation costs       2 years 8 months 5 days    
Total fair value of options vested       $ 18,000,000 $ 14,900,000