Share Capital - Schedule of Share Capital (Parenthetical) (Details)	Dec. 31, 2015 $ / shares	Sep. 30, 2015 £ / shares	Dec. 31, 2014 $ / shares
Share Capital [Line Items]
Common stock, par value | (per share)	$ 0	£ 0.01	$ 0
Preferred stock, par value | (per share)	0	£ 0.01	0
Series A Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series B Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series C Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series D Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series E Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series F Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series G Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series H Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	0		0
Series I Convertible Preferred shares
Share Capital [Line Items]
Preferred stock, par value	$ 0		$ 0