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Convertible Preferred Shares - Convertible Preferred Shares warrant liability (Details)
$ in Thousands
 1 Months Ended
Jan. 31, 2017
USD ($)
Jun. 30, 2016
USD ($)
item
Series B4 Convertible Preferred Shares    
Convertible Preferred Shares    
Number of investors of Series B4 Convertible Preferred Shares given an option to participate in next round of equity financing | item   1
Series C2 Convertible Preferred Shares Warrant [Member]    
Convertible Preferred Shares    
Discount resulted from Warrant exercised $ 1,307 $ 2,400
Maximum | Series C2 Convertible Preferred Shares Warrant [Member]    
Convertible Preferred Shares    
Purchase price of warrant reduced for every investment amount of US$1,000   $ 300