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Significant Agreements - Celgene Collaboration Agreement (Details) - Celgene [Member]
$ / shares in Units, $ in Millions
12 Months Ended
Mar. 20, 2018
USD ($)
agreement_term
$ / shares
shares
Dec. 31, 2018
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Collaboration Agreement, Upfront Payment $ 100.0  
Collaboration Agreement, Potential Regulatory and Commercial Milestone Payments Per Program $ 562.5  
Collaboration Agreement, Term of Agreement 6 years  
Collaboration Agreement, Number of Additional 12 Month Period Extension Allowed | agreement_term 2  
Collaboration Agreement, Extension Fee per Extension Period $ 10.0  
Collaboration Agreement, Upfront Payment, Payment Term   10 days
Collaboration Agreement, Option Fees and Milestone Payments, Payment Term   30 days
Private Placement [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Share Subscription Agreement, Premium Received on Transaction $ 10.2  
Share Subscription Agreement, Number of Ordinary Shares Issued in Transaction | shares 1,174,536  
Share Subscription Agreement, Price Per Share (in dollars per share) | $ / shares $ 42.57  
Share Subscription Agreement, Consideration Received on Transaction $ 50.0  
Share Subscription Agreement, Percent of Share Capital Restriction 9.90%  
Collaboration Program, US Rights [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Collaboration Agreement, Exercise Fee per Program $ 80.0  
Collaboration Program, Global Rights [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Collaboration Agreement, Exercise Fee per Program 55.0  
Collaborative Arrangement [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Initial Transaction Price $ 110.2