Quarterly report pursuant to Section 13 or 15(d)

Share-based compensation - Options Granted to Nonemployees (Details)

v3.8.0.1
Share-based compensation - Options Granted to Nonemployees (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Share based compensation          
Number of options granted outstanding (in shares) 74,145,505   74,145,505   49,237,290
Nonemployees          
Share based compensation          
Number of options granted outstanding (in shares) 3,224,600   3,224,600    
Share based payment expense (benefit) $ 297 $ (24) $ 401 $ (139)