Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Antidilutive Securities (Details)

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Summary of Significant Accounting Policies - Antidilutive Securities (Details) - shares
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Share options    
Antidilutive securities    
Potentially dilutive equity instruments excluded from the diluted loss per share (in shares) 44,159,031 29,951,662
Preferred shares    
Antidilutive securities    
Potentially dilutive equity instruments excluded from the diluted loss per share (in shares)   175,841,800