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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2017
Cash and Cash Equivalents |
Schedule of summary of cash and cash equivalents |
|  |  | December 31, |
|  |  | 2016 |  |  | 2017 |
Cash |  |  |  | $ | 5,332 |  |  |  |  | $ | 1,103 |  |
Investments with original maturity of less than three months at the time of purchase |  |  |  |  | 11,188 |  |  |  |  |  | 22,807 |  |
Total cash and cash equivalents |  |  |  | $ | 16,520 |  |  |  |  | $ | 23,910 |  |

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