Annual report pursuant to Section 13 and 15(d)

Share based compensation - Stock Options Outstanding (Details)

v3.8.0.1
Share based compensation - Stock Options Outstanding (Details)
12 Months Ended
Dec. 31, 2017
£ / shares
shares
Share-based compensation  
Outstanding - Total Share Options | shares 74,943,667
Outstanding - Weighted-Average Remaining Contractual Life 7 years 10 months 24 days
Outstanding - Weighted Average Exercise Price £ 0.58
Exercisable - Total Share Options | shares 31,449,602
Exercisable - Weighted-Average Exercise Price £ 0.51
Exercise Price $0 - $0.25  
Share-based compensation  
Exercise Price, Upper Range Limit £ 0.25
Outstanding - Total Share Options | shares 9,224,274
Outstanding - Weighted-Average Remaining Contractual Life 5 years 7 months 6 days
Outstanding - Weighted Average Exercise Price £ 0.12
Exercisable - Total Share Options | shares 8,508,100
Exercisable - Weighted-Average Exercise Price £ 0.12
Exercise Price $0.26 - $0.50  
Share-based compensation  
Exercise Price, Lower Range Limit 0.26
Exercise Price, Upper Range Limit £ 0.50
Outstanding - Total Share Options | shares 9,694,008
Outstanding - Weighted-Average Remaining Contractual Life 7 years
Outstanding - Weighted Average Exercise Price £ 0.36
Exercisable - Total Share Options | shares 7,477,900
Exercisable - Weighted-Average Exercise Price £ 0.36
Exercise Price $0.51 - $0.75  
Share-based compensation  
Exercise Price, Lower Range Limit 0.51
Exercise Price, Upper Range Limit £ 0.75
Outstanding - Total Share Options | shares 38,859,727
Outstanding - Weighted-Average Remaining Contractual Life 8 years 8 months 12 days
Outstanding - Weighted Average Exercise Price £ 0.58
Exercisable - Total Share Options | shares 6,615,358
Exercisable - Weighted-Average Exercise Price £ 0.51
Exercise Price $0.76 - $1.00  
Share-based compensation  
Exercise Price, Lower Range Limit 0.76
Exercise Price, Upper Range Limit £ 1.00
Outstanding - Total Share Options | shares 13,986,392
Outstanding - Weighted-Average Remaining Contractual Life 7 years 10 months 24 days
Outstanding - Weighted Average Exercise Price £ 0.90
Exercisable - Total Share Options | shares 7,405,720
Exercisable - Weighted-Average Exercise Price £ 0.91
Exercise Price $1.01 - $1.50  
Share-based compensation  
Exercise Price, Lower Range Limit 1.01
Exercise Price, Upper Range Limit £ 1.50
Outstanding - Total Share Options | shares 2,313,651
Outstanding - Weighted-Average Remaining Contractual Life 8 years 10 months 24 days
Outstanding - Weighted Average Exercise Price £ 1.05
Exercisable - Total Share Options | shares 576,909
Exercisable - Weighted-Average Exercise Price £ 1.06
Exercise Price $1.51 - $2.00  
Share-based compensation  
Exercise Price, Lower Range Limit 1.51
Exercise Price, Upper Range Limit £ 2.00
Outstanding - Total Share Options | shares 865,615
Outstanding - Weighted-Average Remaining Contractual Life 4 years 10 months 24 days
Outstanding - Weighted Average Exercise Price £ 1.82
Exercisable - Total Share Options | shares 865,615
Exercisable - Weighted-Average Exercise Price £ 1.82