Annual report pursuant to Section 13 and 15(d)

Investment in Viking - Narrative (Details)

v3.10.0.1
Investment in Viking - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
May 23, 2018
Apr. 13, 2016
May 31, 2014
Mar. 31, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jul. 15, 2017
Apr. 30, 2016
Jan. 31, 2016
Aug. 31, 2014
Variable Interest Entity [Line Items]                      
Proceeds received from repayment of Viking note receivable         $ 3,914 $ 200 $ 300        
Value of consideration received for repayment of convertible notes $ 3,900                    
Exercise price of warrants (USD per share)                     $ 125.08
Warrants         9,300 $ 3,900          
Debt | Viking                      
Variable Interest Entity [Line Items]                      
Convertible loan facility extended     $ 2,500                
Equity Method Investee                      
Variable Interest Entity [Line Items]                      
Aggregate ownership (as a percent)           17.60% 30.30%        
Increase (decrease) in equity method investment           $ 2,700 $ (10,700)        
Loss recorded (as a percent)       12.40%              
Amount of loan to be repaid upon consummation of first capital financing transaction                   $ 1,500  
Proceeds received from repayment of Viking note receivable   $ 300                  
Shares received pursuant to MLA amendment (shares)   960,000                  
Amount of loan to be repaid in cash upon consummation of first capital financing transaction               $ 200      
Exercise price of warrants (USD per share)                 $ 1.50    
Other than temporary impairment of investment in Viking             7,400        
Warrants                      
Variable Interest Entity [Line Items]                      
Gain on changes in fair value         $ 5,400 $ 3,200 $ 300        
Viking Therapeutics, Inc.                      
Variable Interest Entity [Line Items]                      
Ownership interest (as a percent)         8.80%