Quarterly report pursuant to Section 13 or 15(d)

Share-based compensation - Options (Details)

v3.5.0.2
Share-based compensation - Options (Details) - $ / shares
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based compensation        
Number of options granted (in shares) 2,414,576 0 17,758,373 11,069,517
Weighted average fair value (in dollars per share) $ 0.74   $ 0.74 $ 0.94