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Stock-Based Compensation - Additional Information (Detail)
3 Months Ended 6 Months Ended 12 Months Ended
Jan. 01, 2019
shares
Jun. 30, 2019
USD ($)
shares
Mar. 31, 2019
USD ($)
Milestone
Jun. 30, 2018
USD ($)
shares
Mar. 31, 2018
shares
Mar. 31, 2017
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
$ / shares
shares
Dec. 31, 2018
shares
Dec. 31, 2017
Sep. 20, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Total number of options outstanding   11,045,846         11,045,846        
Common stock available for issuance under stock option plan   2,781,281         2,781,281        
Stock-based compensation expense | $   $ 34,767,000   $ 29,028,000     $ 78,883,000 $ 44,845,000      
Weighted average grant date fair value per share | $ / shares             $ 99.11 $ 114.72      
2011 Stock Option Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted             0        
2014 Stock Option Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Common stock shares annual increase added to plan 1,875,530                    
2014 Stock Option Plan [Member] | Maximum [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Percentage of increase on outstanding shares of Common stock                 4.00%    
2016 Stock Option Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Total number of shares reserved for issuance                     1,200,000
Restricted Stock Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units granted           32,500 370,456        
Share based compensation granted under plan vest period           2 years          
Fair value of restricted stock units vested | $   $ 0   0     $ 2,000,000.0 $ 2,600,000      
Stock-based compensation expense | $       $ 155,000     $ 58,000 $ 324,000      
Restricted Stock Units [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 Units [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 Restricted Stock Units [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units granted   16,345     33,600   370,456        
Performance Restricted Stock Units [Member] | Commercial Milestones [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Restricted stock units granted       37,800              
Performance Shares [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted       200,250     0 524,003      
Total unrecognized stock-based compensation expense | $   $ 35,200,000         $ 35,200,000        
Number of shares outstanding and unvested stock options   505,131         505,131        
Performance-Based Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Milestones not achieved | Milestone     1                
Stock-based compensation expense | $   $ 0 $ 14,200,000         $ 0      
Percentage of performance based grants that were achieved                 20.00% 33.00%  
Performance-Based Stock Options [Member] | Consultant [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense | $       $ 6,900,000              
Commercial Milestones [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock-based compensation expense | $   $ 2,100,000         $ 16,300,000        
Stock Options [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Options granted             1,355,931        
Total number of options outstanding   7,859,290         7,859,290   7,530,767    
Stock-based compensation expense | $   $ 34,280,000   $ 28,627,000     $ 77,844,000 44,007,000      
Total unrecognized stock-based compensation expense | $   $ 310,700,000         $ 310,700,000        
Weighted average period of unrecognized compensation costs             2 years 8 months 26 days        
Intrinsic value of options exercised | $             $ 87,400,000 $ 64,400,000