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December 2016 Financing (Details)
$ / shares in Units, $ in Millions
Dec. 19, 2016
USD ($)
$ / shares
shares
Dec. 14, 2016
€ / shares
shares
Sep. 23, 2015
shares
Dec. 19, 2016
€ / shares
shares
December 2016 Financing        
Number of common shares represented by each ADS share     0.1  
December 2016 Financing        
December 2016 Financing        
Aggregate ADS shares subscribed for by holders of ADS 1,592,750      
Aggregate number of common shares represented by the aggregate ADS shares subscribed for by holders of ADS 159,275      
Number of common shares represented by each ADS share 0.1      
Aggregate number of common shares subscribed for by holders of common shares 102,077      
December 2016 Financing | ADS | ADS Right        
December 2016 Financing        
Number of rights into which each share of stock converted 0.276      
Number of shares into which each right was entitled 1     1
Per share exercise price of right | (per share) $ 4.32     € 4.014
December 2016 Financing | Common Stock        
December 2016 Financing        
Number of shares sold 588,127      
Gross proceeds from sale of shares | $ $ 24.8      
Net proceeds from sale of shares, after deducting underwriting fees and offering expenses | $ $ 20.6      
December 2016 Financing | Common Stock | Common Share Right        
December 2016 Financing        
Number of shares into which each right was entitled 0.276     0.276
Per share exercise price of right | € / shares       € 40.14
December 2016 Financing Underwriting | Common Stock        
December 2016 Financing        
Number of shares sold   326,775    
Shares issued price per share | € / shares   € 40.14