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RESTRUCTURING - Additional Information (Details) - USD ($) $ in Thousands		12 Months Ended
	Jun. 28, 2018	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring and Related Activities [Abstract]
Restructuring charges recognized		$ 4,431	$ 9,120
Reduction in workforce (percent)	9.00%
Unpaid accrued liabilities		$ 117	$ 202	$ 0

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- Definition

Restructuring Charges and Disposal Group, Including Discontinued Operation, Restructuring Charges

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No definition available.

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- Definition

Restructuring Reserve and Disposal Group, Including Discontinued Operations, Restructuring Reserve

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No definition available.

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- Definition

Restructuring and Related Cost, Expected Number of Positions Eliminated, Percent

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No definition available.

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No definition available.

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