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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Trade Accounts Receivable
Concentration Risk [Line Items]
Percentage	25.00%	32.00%
Accounts Receivable
Concentration Risk [Line Items]
Percentage	45.00%	52.00%
Sales Revenue, Net
Concentration Risk [Line Items]
Percentage	10.00%	12.00%
UNITED STATES | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage	24.00%	20.00%
CANADA | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage	13.00%
SWITZERLAND | Sales Revenue, Net
Concentration Risk [Line Items]
Percentage		20.00%

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- Definition

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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