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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Concentration of Credit Risk (Details) | 12 Months Ended
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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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