General - Additional Information (Details)	9 Months Ended
	Sep. 30, 2015 $ / shares	Sep. 30, 2015 £ / shares	Dec. 31, 2014 $ / shares
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Common stock, no par value | $ / shares
Preferred stock, no par value | $ / shares
Share split ratio	5.913
Ordinary shares par value		£ 0.01
preferred shares par value		£ 0.01