Annual report pursuant to Section 13 and 15(d)

Income taxes - Income before Income Taxes (Details)

v3.8.0.1
Income taxes - Income before Income Taxes (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Income taxes        
Loss before income taxes $ (23,055) $ (69,687) $ (70,687) $ (21,814)
UNITED STATES        
Income taxes        
Loss before income taxes (1,771) (3,121) (3,373) (1,108)
U.K.        
Income taxes        
Loss before income taxes $ (21,284) $ (66,566) $ (67,314) $ (20,706)