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CONCENTRATION OF RISK - Additional Information (Details) - supplier	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Number of suppliers from which chemical materials were purchased	1
Excluding North America [Member] | Total Revenue [Member] | Customer Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (less than 1% for contracts with U.S. government agencies)	97.00%	94.00%	97.00%

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- Definition

The number of suppliers from which all chemical materials were purchased.

+ References

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

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.

+ References

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