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Stock Compensation - Additional Information (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2009
Jun. 30, 2008
Jun. 30, 2016
Mar. 31, 2016
Mar. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 1997
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options outstanding (in shares)       12,254,166     12,254,166   10,232,969  
Options issued (in shares)             4,490,700      
Stock Option Plan 2006                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares available for grant (in shares)       0     0      
Stock Option Plan 2001                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of options outstanding (in shares)       0     0      
Stock Option Plan 2014                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares available for grant (in shares)       8,497,040     8,497,040      
Inducement Awards                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares)           0        
Employee Stock Purchase Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Number of shares authorized (in shares)                   500,000
Additional shares authorized (in shares) 750,000 750,000 500,000              
Payroll withholding period 3 months                  
Number of ESPP shares issued (in shares)             174,690 128,151    
Minimum | Employee Stock Purchase Plan                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Purchase price as percentage of market value 85.00%                  
Stock options                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Expiration period       10 years     10 years      
Stock options | Inducement Awards | Chief Executive Officer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period         4 years          
Options issued (in shares)         1,500,000          
Stock options | Inducement Awards | Chief Financial Officer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period         4 years          
Options issued (in shares)         550,000          
Stock options | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period             4 years      
Restricted shares or units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Total unrecognized compensation expense       $ 16.2     $ 16.2      
Recognition period             1 year 7 months 1 day      
Restricted shares or units | Inducement Awards | Chief Executive Officer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period         18 months          
Stock issued (in shares)         200,000          
Performance share units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Potential increase in units earned (up to) (as percent)       60.00%     60.00%      
Potential increase in compensation cost (up to) (as percent)       60.00%     60.00%      
Performance share units | Inducement Awards                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Vesting period         3 years          
Performance share units | Inducement Awards | Chief Financial Officer                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock issued (in shares)         150,000          
Stock and stock units                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Fair value of stock and stock unit awards vested             $ 11.7 $ 6.8