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, 2016
Dec. 31, 2018
Dec. 31, 2017
Share options      
Antidilutive securities      
Weighted average number of share options (in shares) 45,882,791 88,553,474 70,374,832