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Subsequent Event (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
Feb. 21, 2020
Feb. 29, 2020
Dec. 31, 2019
Dec. 30, 2019
Dec. 31, 2018
Subsequent Event [Line Items]          
Ordinary shares, nominal value (in usd per share)     $ 0.01   $ 0.01
Preferred shares, nominal value (in usd per share)     $ 0.01   $ 0.01
Ordinary shares, shares issued (in shares)     42,927   42,720
Ordinary shares, shares outstanding (in shares)     37,520   37,313
Securities Purchase Agreement | Pro Forma          
Subsequent Event [Line Items]          
Ordinary shares, shares issued (in shares)       51,927  
Ordinary shares, shares outstanding (in shares)       46,200  
Subsequent event          
Subsequent Event [Line Items]          
Maximum aggregate offering price of securities under shelf registration   $ 0      
Ordinary shares, nominal value (in usd per share)   $ 0.01      
Preferred shares, nominal value (in usd per share)   $ 0.01      
Maximum aggregate offering price of ADSs under shelf registration   $ 50,000      
Maximum threshold percentage for trigger of convertible preferred stock 9.99%        
Subsequent event | Securities Purchase Agreement          
Subsequent Event [Line Items]          
Stock issued during period, value, new issues $ 65,000        
Proceeds from issuance of private placement $ 61,100        
Shares issued, price per share (in dollars per share) $ 7.09        
Subsequent event | Securities Purchase Agreement | American Depositary Receipts          
Subsequent Event [Line Items]          
Stock issued during period, new issues (in shares) 8,680        
Subsequent event | Securities Purchase Agreement | Series A Preferred Stock          
Subsequent Event [Line Items]          
Stock issued during period, new issues (in shares) 488