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Cash and Cash Equivalents (Tables) | 12 Months Ended
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Dec. 31, 2019
Cash and Cash Equivalents |
Summary of Cash and Cash Equivalents | The following is a summary of cash and cash equivalents at December 31, 2018 and 2019 (in thousands):
|  | December 31,
|  | 2018 |  | 2019
Cash |  | $ | 816 |  | $ | 743
Investments with original maturity of less than three months at the time of purchase |  |  | 16,688 |  |  | 11,142
Total cash and cash equivalents |  | $ | 17,504 |  | $ | 11,885

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