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Fair value measurement - BMS warrants (Details) - USD ($)
$ in Thousands
2 Months Ended 4 Months Ended 12 Months Ended
Jun. 12, 2015
Aug. 07, 2015
Dec. 31, 2016
Dec. 31, 2015
BMS Warrants        
Fair value measurements        
Gain (Loss) recorded due to changes in fair value of derivative asset $ (7,300) $ (300)    
Recurring | Fair value hierarchy Level 3 | BMS Warrants        
Fair value measurements        
Fair value of derivative asset     $ 100 $ 600
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Other nonoperating income (expense)        
Fair value measurements        
Gain (Loss) recorded due to changes in fair value of derivative asset     500 $ 500
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo        
Fair value measurements        
Fair value of derivative asset     51  
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points     90  
Fair value of derivative asset if extend exercise dates by one year     $ 80  
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo | Minimum        
Fair value measurements        
Expected term before exercise     3 years  
Recurring | Fair value hierarchy Level 3 | BMS Warrants | Monte-Carlo | Maximum        
Fair value measurements        
Expected term before exercise     5 years  
Recurring | Fair value hierarchy Level 3 | BMS 7th Warrant | Monte-Carlo        
Fair value measurements        
Fair value of derivative asset     $ 21  
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points     41  
Fair value of derivative asset if extend exercise dates by one year     42  
Recurring | Fair value hierarchy Level 3 | BMS 10thWarrant | Monte-Carlo        
Fair value measurements        
Fair value of derivative asset     30  
Fair value of derivative asset if increase volatility by ten percentage-points to eighty-five percentage points     49  
Fair value of derivative asset if extend exercise dates by one year     $ 38