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Lease Exit Liability (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Jul. 16, 2008
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Jun. 30, 2016
Restructuring Cost and Reserve [Line Items]          
Lease expiration date 2018-02        
Restructuring Costs [Abstract]          
Potential future payment under purchase agreement $ 5,000        
Incremental in-process research and development expense   $ 0 $ 0    
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals         $ 1,300
Reduction in R&D expense   1,300      
Minimum [Member]          
Restructuring Costs [Abstract]          
Potential payment under license of product 8,000        
Maximum [Member]          
Restructuring Costs [Abstract]          
Potential payment under license of product $ 12,000        
Contract Termination [Member]          
Restructuring Costs [Abstract]          
Accrual beginning balance       $ 4,713  
Principal payments       (2,473)  
Accrual balance at June 30, 2016   $ 2,240   $ 2,240