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Equity Transactions (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 28, 2020
Feb. 21, 2020
Feb. 29, 2020
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Class of Stock [Line Items]            
Maximum aggregate offering price of securities under shelf registration     $ 250,000      
Ordinary shares, nominal value (in usd per share)     $ 0.01 $ 0.01   $ 0.01
Preferred shares, nominal value (in usd per share)     $ 0.01 $ 0.01   $ 0.01
Maximum aggregate offering price of ADSs under shelf registration     $ 50,000      
Stock transaction issuance costs     $ 340,000      
February 2020 private placement       $ 60,733,000    
Proceeds from the February 2020 private placement       60,733,000 $ 0  
Maximum threshold percentage for trigger of convertible preferred stock   9.99%        
Additional paid-in capital            
Class of Stock [Line Items]            
Stock transaction issuance costs   $ 4,267,000        
February 2020 private placement       $ 60,641,000    
Securities Purchase Agreement            
Class of Stock [Line Items]            
February 2020 private placement   65,000,000        
Proceeds from the February 2020 private placement   $ 60,733,000        
Over-Allotment Option | Subsequent Event            
Class of Stock [Line Items]            
Shares sold in offering 1,745          
American Depositary Receipts | Securities Purchase Agreement            
Class of Stock [Line Items]            
February 2020 private placement (in shares)   8,680,000        
Series A Preferred Stock | Securities Purchase Agreement            
Class of Stock [Line Items]            
February 2020 private placement (in shares)   488        
Shares issued, price per share (in dollars per share)   $ 7.09        
American Depositary Shares | Public Offering | Subsequent Event            
Class of Stock [Line Items]            
Shares sold in offering 11,630          
Offering price per share (in dollars per share) $ 10.75          
Aggregate net proceeds from stock offering $ 125,000,000