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Equity (Narrative) (Details)
Dec. 31, 2019
USD ($)
class
$ / shares
shares
Dec. 31, 2018
$ / shares
Jul. 01, 2015
vote
Class of Stock [Line Items]      
Share capital authorized, aggregate nominal amount | $ $ 20,000,000.0    
Minimum number of classes or series of stock which may be authorized | class 1    
Class A      
Class of Stock [Line Items]      
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01  
Number of votes allowed per class of stock (in votes) | vote     10
Number of ordinary shares convertible to certain class of ordinary shares (in shares) | shares 1    
Class B      
Class of Stock [Line Items]      
Common stock, nominal value (in dollars per share) $ 0.01 0.01  
Number of votes allowed per class of stock (in votes) | vote     1
Common reserved for issuance (in shares) | shares 12,151,526    
Class C      
Class of Stock [Line Items]      
Common stock, nominal value (in dollars per share) $ 0.01 $ 0.01