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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 |

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