Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Antidilutive Securities (Details)

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Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
6 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Jun. 30, 2015
Share options        
Antidilutive securities        
Weighted average number of share options (in shares) 31,203,477 70,374,832 45,882,791 31,473,477
Preferred shares        
Antidilutive securities        
Weighted average number of share options (in shares)       122,848,381