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Collaboration with GlaxoSmithKline Intellectual Property Development Limited (Details)
$ in Thousands
1 Months Ended 3 Months Ended 25 Months Ended
Nov. 30, 2015
person
Mar. 31, 2017
USD ($)
agreement
item
Mar. 31, 2016
USD ($)
Nov. 30, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Alliance revenue   $ 378 $ 294    
Deferred revenue, current portion   985     $ 1,111
Deferred Revenue, Noncurrent         $ 152
Expenses   $ 15,566 13,212    
GSK Agreement          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Deferred revenue recognition period 27 months        
Number of development candidates 1 1      
Number of units of accounting in connection of agreements | item   2      
Alliance revenue   $ 300 $ 300    
Deferred revenue   1,000      
GSK Agreement | Clinical and Commercial Milestones          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Milestone payments   $ 89,000      
GSK Agreement | Maximum          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Anticipated initial collaboration term 4 years        
Number of optional additional targets   2   2  
Maximum royalty percentage on net sales   5.00%      
GSK Agreement | Maximum | License, Research, Clinical Development and Commercialization          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Milestone payments   $ 100,000      
GSK Agreement | Maximum | Research and Development Plans and Designation of Development Candidates          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Milestone payments   $ 9,000      
GSK Agreement | Minimum          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Anticipated initial collaboration term 2 years        
Up-front Payment Arrangement | GSK Agreement          
Collaborative Arrangements and Non-collaborative Arrangement Transactions          
Upfront payment received under collaboration agreement       $ 2,500