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Ordinary shares (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended
Aug. 05, 2014
Feb. 06, 2014
Mar. 22, 2016
Jun. 30, 2013
Dec. 31, 2016
Dec. 31, 2014
Aug. 31, 2014
Stockholders' Equity, Reverse Stock Split         On January 26, 2014, the Company effected the issuance of 6.55-to-1 bonus shares, which was equivalent to a 7.55-to-1 share split.    
Stock Issued During Period, Shares, New Issues     2,161,290        
Stock Issued During Period, Value, New Issues     $ 6,089   $ 6,089 $ 31,405  
Stock Issued During Period Ordinary Shares Issued Upon Private Placement Shares   782,537          
Stock Issued During Period Ordinary Shares Issued Upon Private Placement Value   $ 4,368       $ 4,368  
Shares Issued, Price Per Share   $ 6.07 $ 3.10 $ 0.95 $ 3.10 $ 0.95  
IPO [Member]              
Share Purchase Agreement, Value to be issued $ 31,405            
Stock Issued During Period, Shares, New Issues 3,200,000            
Shares Issued, Price Per Share           $ 11.00 $ 11.00
Purchase Agreement [Member]              
Share Purchase Agreement, Shares to be issued       2,130,159      
Share Purchase Agreement, Value to be issued       $ 2,024