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Fair value of financial instruments and marketable securities - Warrants and SARs (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
$ / shares
Changes in the fair value of warrant liability and SARs liability        
Additions   $ 0 $ 0  
Weighted-average discount rate - finance lease   7.80%    
SARs        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance $ 3,814 $ 3,186 3,814  
Change in fair value   0 1,961  
Payments   (3,186) (3,815)  
Rights Exchange settlement   0    
Ending Balance   0 1,960  
Commitments        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance $ 257,040 290,500 257,040  
Additions   0 0  
Change in fair value   (15,220) 20,360  
Payments   0 0  
Rights Exchange settlement   (139,180)    
Ending Balance   136,100 277,400  
SARs        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance   $ 3,186    
Measurement Input, Option Volatility | SARs        
Fair value of warrant liability        
Alternative Investment, Measurement Input       28.93
Measurement Input, Risk Free Interest Rate | SARs        
Fair value of warrant liability        
Alternative Investment, Measurement Input       0.19
Measurement Input, Expected Term | SARs        
Fair value of warrant liability        
Expected term (in years) 3 days      
Minimum | SARs        
Fair value of warrant liability        
Alternative Investment, Measurement Input | $ / shares       6.76
Maximum | SARs        
Fair value of warrant liability        
Alternative Investment, Measurement Input | $ / shares       30.86
Common stock | Measurement Input, Share Price | SARs        
Fair value of warrant liability        
Alternative Investment, Measurement Input | $ / shares       48.03
Liability, Net Sales Milestones and Royalties [Member] | Minimum | Probability of Success [Member] | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.25   0.25
Liability, Net Sales Milestones and Royalties [Member] | Maximum | Probability of Success [Member] | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.94   0.89
Development and Regulatory Milestone | Minimum | Probability of Success [Member] | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.25   0.25
Development and Regulatory Milestone | Maximum | Probability of Success [Member] | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.94   0.94
Agilis | Liability, Net Sales Milestones and Royalties [Member]        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance   $ 65,800    
Ending Balance   $ 89,600    
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Measurement Input, Discount Rate | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.120   0.145
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Minimum | Sales Milestones | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone       $ 0
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Minimum | Percentage of Sales for Royalties | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.02   0.02
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Minimum | Potential Net Sales Milestones [Domain] | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone   $ 0    
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Maximum | Sales Milestones | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone       $ 150,000
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Maximum | Percentage of Sales for Royalties | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input   0.06   0.06
Agilis | Liability, Net Sales Milestones and Royalties [Member] | Maximum | Potential Net Sales Milestones [Domain] | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone   $ 150,000    
Agilis | Development and Regulatory Milestone        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance   290,500    
Ending Balance   136,100    
Agilis | Development and Regulatory Milestone | Minimum | Development and Regulatory Milestone | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone   $ 0   $ 0
Agilis | Development and Regulatory Milestone | Minimum | Measurement Input, Discount Rate | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input       0.022
Changes in the fair value of warrant liability and SARs liability        
Weighted-average discount rate - finance lease   4.60%    
Agilis | Development and Regulatory Milestone | Maximum | Development and Regulatory Milestone | Commitments        
Fair value of warrant liability        
Alternative Investment, Milestone   $ 381,000   $ 555,000
Agilis | Development and Regulatory Milestone | Maximum | Measurement Input, Discount Rate | Commitments        
Fair value of warrant liability        
Alternative Investment, Measurement Input       0.047
Changes in the fair value of warrant liability and SARs liability        
Weighted-average discount rate - finance lease   6.10%    
Significant unobservable inputs (level 3)        
Changes in the fair value of warrant liability and SARs liability        
Ending Balance   $ 89,600    
Significant unobservable inputs (level 3) | Agilis        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance   65,800    
Significant unobservable inputs (level 3) | Agilis | Liability, Net Sales Milestones and Royalties [Member]        
Changes in the fair value of warrant liability and SARs liability        
Beginning Balance $ 53,200 65,800 53,200  
Additions   0 0  
Change in fair value   23,800 5,600  
Payments   0 0  
Rights Exchange settlement   0    
Ending Balance   $ 89,600 $ 58,800