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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash And Cash Equivalents [Abstract] |
Summary of Cash and Cash Equivalents |
|  | As of December 31, |
|  | 2016 |  |  | 2017 |
|  | $ |  |  | $ |
Cash at bank and in hand |  |  | 36,531,272 |  |  |  | 204,008,828 |
Cash equivalents |  |  | 47,417,498 |  |  |  | 25,651,320 |
|  |  | 83,948,770 |  |  |  | 229,660,148 |
Denominated in: |  |  |  |  |  |  |  |
US$ |  |  | 77,463,141 |  |  |  | 224,878,393 |
RMB (note (i)) |  |  | 6,365,311 |  |  |  | 3,927,163 |
Australia dollar ("A$") |  |  | 120,318 |  |  |  | 854,592 |
|  |  | 83,948,770 |  |  |  | 229,660,148 |

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- Definition Tabular disclosure of the components of cash and cash equivalents. + References No definition available. + Details
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