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Commitments and Contingencies - CyDex License Agreement - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Commitments And Contingencies [Line Items]              
Research and development expense $ 45,200,000     $ 23,581,000      
CyDex License Agreement [Member]              
Commitments And Contingencies [Line Items]              
Research and development expense         $ 100,000    
Research and development expense related to milestone expense 0            
Milestone payments 0            
CyDex License Agreement [Member] | First and Second Clinical Development Milestones [Member] | SAGE-547 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments 800,000            
CyDex License Agreement [Member] | First and Second Regulatory Milestones [Member] | SAGE-547 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments 3,800,000            
CyDex License Agreement [Member] | Third and Fourth Clinical Development Milestones [Member] | SAGE-547 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments 1,300,000            
CyDex License Agreement [Member] | Third and Fourth Regulatory Milestones [Member] | SAGE-547 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments 8,500,000            
CyDex License Agreement [Member] | Clinical Development [Member]              
Commitments And Contingencies [Line Items]              
Research and development expense related to milestone expense   $ 500,000 $ 300,000     $ 500,000 $ 300,000
CyDex License Agreement [Member] | Clinical Development [Member] | SAGE-689 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments 800,000            
CyDex License Agreement [Member] | Regulatory Milestones [Member] | SAGE-689 [Member] | Maximum [Member]              
Commitments And Contingencies [Line Items]              
Expected milestone payments $ 1,800,000