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Cash and Cash Equivalents (Tables)

12 Months Ended

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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Tabular disclosure of the components of cash and cash equivalents.

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