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Commitments and contingencies - Other Agreements - (Details)
12 Months Ended
Dec. 31, 2018
USD ($)
item
Dec. 31, 2017
USD ($)
item
Dec. 31, 2016
USD ($)
multiple
Sep. 30, 2016
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Patent costs incurred $ 600,000      
Loss Contingency [Abstract]        
Contingency reserves for litigation liabilities 0      
General and administrative        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Patent costs incurred $ 600,000 $ 800,000 $ 1,800,000  
Various contract research organizations and institutions        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Number of milestones achieved | item 0 0    
Various contract research organizations and institutions | Minimum        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Number of days written notice required by reporting entity to terminate agreement 30 days      
Various contract research organizations and institutions | Maximum        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Number of days written notice required by reporting entity to terminate agreement 90 days      
Non-profit organization agreement        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Maximum funding     $ 4,000,000  
Funding multiple | multiple     2.60  
Milestone payment liability   $ 1,000,000    
MRIC        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Amount of investment       $ 2,000,000