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Commitments and Contingencies (Detail)
 1 Months Ended 6 Months Ended
May 31, 2017
USD ($)
Aug. 31, 2010
USD ($)
Jun. 30, 2017
USD ($)
draw
term
Jun. 30, 2016
USD ($)
Shared Services Agreement        
Initial term of lease     123 months  
Number of terms lease can be extended | term     2  
Renewal term option of lease     60 months  
Annual base rent     $ 600,000  
Rent free term     3 months  
Yearly increases in base rent     3.00%  
Tenant improvement allowance     $ 1,900,000  
Number of draws taken on the additional improvement allowance | draw     0  
Commercialization award received   $ 10,300,000    
Commercialization award term   3 years    
Payment for termination of grant repayment and other obligations $ 5,000,000      
Standby Letters of Credit        
Shared Services Agreement        
Initial amount of standby letter of credit     $ 2,400,000 $ 2,400,000.0