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Restructuring Charge (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 26, 2016
USD ($)
ft²
item
Sep. 30, 2016
USD ($)
shares
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Jun. 30, 2016
USD ($)
shares
Jun. 30, 2015
USD ($)
Jun. 30, 2014
USD ($)
Feb. 29, 2016
USD ($)
ft²
Restructuring Cost and Reserve [Line Items]                  
Restructuring charges     $ 301,000 $ 4,130,000 $ 4,431,000        
Stock compensation expense (reduction)         8,100,000 $ 21,900,000 $ 15,300,000 $ 15,600,000  
Leasehold impairment charge         970,000        
Construction allowance     5,914,000   5,914,000 $ 6,236,000 $ 6,301,000    
Restructuring Reserve                  
Additional charge in Q2     301,000 4,130,000 4,431,000        
Workforce reduction                  
Restructuring Cost and Reserve [Line Items]                  
Approximate positions to be eliminated (as a percent) 17.00%                
Approximate positions to be eliminated | item 65                
Approximate current positions to be eliminated | item 60                
Restructuring charges $ 4,400,000       273,000        
One-time termination benefit         2,800,000        
Benefit plan severance cost         593,000        
Restructuring Reserve                  
Additional charge in Q2 4,400,000       273,000        
Cash payments for restructuring         (1,657,000)        
Balance at the End of the year $ 3,135,000   $ 1,751,000   $ 1,751,000        
930 Winter Street, Walham, MA                  
Restructuring Cost and Reserve [Line Items]                  
Area of space leased | ft²                 10,281
Leasehold improvement cost   $ 193,000   193,000          
Construction allowance                 $ 617,000
930 Winter Street, Walham, MA | Lease                  
Restructuring Cost and Reserve [Line Items]                  
Area of space leased | ft² 10,281                
Estimated period to sub-lease 9 months                
Leasehold impairment charge       $ 970,000          
Stock options                  
Restructuring Cost and Reserve [Line Items]                  
Forfeited (in shares) | shares         1,670,000 661,000      
Granted (in shares) | shares         3,536,000 3,340,000      
Stock options | Workforce reduction                  
Restructuring Cost and Reserve [Line Items]                  
Forfeited (in shares) | shares         762,000        
Stock compensation expense (reduction)         $ (837,000)        
Granted (in shares) | shares   847,000              
Vesting period   3 years