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Agreements - Biotest (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2008
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2006
Collaborative Agreements disclosures                                  
Costs related to the research and development services   $ 33,657,000 $ 32,909,000 $ 38,652,000 $ 36,094,000 $ 38,199,000 $ 35,132,000 $ 30,437,000 $ 25,666,000 $ 27,647,000 $ 28,018,000 $ 66,566,000 $ 73,331,000 $ 148,077,000 $ 111,768,000 $ 106,958,000  
Biotest                                  
Collaborative Agreements disclosures                                  
Payments received under collaboration agreement                                 $ 1,000,000
Potential milestone payments                                 35,500,000
Opt-in-fee payable on exercise of right                                 15,000,000
Costs related to the research and development services                       22,000   160,000 309,000 305,000  
Costs related to clinical materials sold                       549,000   $ 1,800,000 $ 3,000,000 $ 670,000  
Biotest | Development milestones                                  
Collaborative Agreements disclosures                                  
Payments received under collaboration agreement $ 500,000                                
Potential milestone payments                                 4,500,000
Biotest | Phase IIb Clinical Trial                                  
Collaborative Agreements disclosures                                  
Potential milestone payments   $ 2,000,000                   $ 2,000,000          
Biotest | Regulatory milestones                                  
Collaborative Agreements disclosures                                  
Potential milestone payments                                 $ 31,000,000