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Share-Based Compensation - Details of Non-Employee Warrants (Details) - BSA - € / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of grants (in shares) 48,655,000 38,070,000 5,040,000
Plan A      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 2 years    
Contractual life (in years) 10 years    
Number of grants (in shares) 231,792,000    
Share entitlement per warrant (in shares) 1    
Share warrant price (in Euro per share) € 0.02    
Exercise price (in Euro per share) 0.70    
Grant date share fair value (in Euro per share) € 0.20    
Expected volatility rate 55.70%    
Discount rate 3.58%    
Fair value per warrant (in Euro per share) € 0.05    
Plan B      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 3 years    
Contractual life (in years) 10 years    
Number of grants (in shares) 277,200,000    
Share entitlement per warrant (in shares) 1    
Exercise price (in Euro per share) € 0.70    
Grant date share fair value (in Euro per share) € 0.70    
Expected volatility rate 55.20%    
Discount rate 3.44%    
Plan B | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) € 0.07    
Fair value per warrant (in Euro per share) 0.33    
Plan B | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) 0.11    
Fair value per warrant (in Euro per share) € 0.38    
Plan C      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 2 years    
Contractual life (in years) 10 years    
Number of grants (in shares) 192,000,000    
Share entitlement per warrant (in shares) 1    
Plan C | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) € 0.04    
Exercise price (in Euro per share) 0.70    
Grant date share fair value (in Euro per share) € 0.70    
Expected volatility rate 53.50%    
Discount rate 2.62%    
Fair value per warrant (in Euro per share) € 0.40    
Plan C | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) 0.30    
Exercise price (in Euro per share) 5.95    
Grant date share fair value (in Euro per share) € 4.98    
Expected volatility rate 55.00%    
Discount rate 3.38%    
Fair value per warrant (in Euro per share) € 2.58    
Plan D      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 2 years    
Contractual life (in years) 10 years    
Number of grants (in shares) 125,784,000    
Share entitlement per warrant (in shares) 1    
Plan D | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) € 0.43    
Exercise price (in Euro per share) 8.28    
Grant date share fair value (in Euro per share) € 6.43    
Expected volatility rate 50.00%    
Discount rate 2.13%    
Fair value per warrant (in Euro per share) € 2.85    
Plan D | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share warrant price (in Euro per share) 0.48    
Exercise price (in Euro per share) 9.65    
Grant date share fair value (in Euro per share) € 9.65    
Expected volatility rate 50.20%    
Discount rate 2.27%    
Fair value per warrant (in Euro per share) € 4.98    
Plan E      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual life (in years) 10 years    
Number of grants (in shares) 38,070,000    
Share entitlement per warrant (in shares) 1    
Expected volatility rate 39.90%    
Plan E | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 1 year    
Share warrant price (in Euro per share) € 9.98    
Exercise price (in Euro per share) 35.18    
Grant date share fair value (in Euro per share) € 35.18    
Discount rate 0.00%    
Fair value per warrant (in Euro per share) € 9.98    
Plan E | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Share warrant price (in Euro per share) € 16.82    
Exercise price (in Euro per share) 41.02    
Grant date share fair value (in Euro per share) € 41.02    
Discount rate 0.52%    
Fair value per warrant (in Euro per share) € 16.82    
Plan F      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Contractual life (in years) 10 years    
Number of grants (in shares) 48,655,000    
Share entitlement per warrant (in shares) 1    
Expected volatility rate 40.60%    
Plan F | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 1 year    
Share warrant price (in Euro per share) € 13.89    
Exercise price (in Euro per share) 33.98    
Grant date share fair value (in Euro per share) € 33.98    
Discount rate 0.10%    
Fair value per warrant (in Euro per share) € 13.89    
Plan F | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period (in years) 4 years    
Share warrant price (in Euro per share) € 14.55    
Exercise price (in Euro per share) 35.41    
Grant date share fair value (in Euro per share) € 35.41    
Discount rate 0.25%    
Fair value per warrant (in Euro per share) € 14.55