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SIGNIFICANT ACCOUNTING POLICIES - Significant risks and uncertainties - Foreign currency risk (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Significant risks and uncertainties
Cash and cash equivalents	$ 104,084	$ 158,691
Currency Concentration Risk | Cash and cash equivalents | RMB
Significant risks and uncertainties
Cash and cash equivalents	$ 42,068	$ 65,375
Concentration risk, Percentage	41.00%	42.00%

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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