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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Concentration Risk [Line Items]
Revenues	$ 43,572	$ 55,566
South Korea [Member]
Concentration Risk [Line Items]
Revenues	30,774	47,928
China [Member]
Concentration Risk [Line Items]
Revenues	8,852	2,482
Japan [Member]
Concentration Risk [Line Items]
Revenues	875	1,084
Other Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues	561	712
Total Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues	41,062	52,206
UNITED STATES
Concentration Risk [Line Items]
Revenues	$ 2,510	$ 3,360

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+ References

No definition available.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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