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CONCENTRATION OF RISK - Revenues by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2017	[1]	Sep. 30, 2017	Jun. 30, 2017	[1]	Mar. 31, 2017	Dec. 31, 2016	[1]	Sep. 30, 2016	Jun. 30, 2016	[1]	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Concentration Risk [Line Items]
Revenues	$ 115,867		$ 61,683	$ 102,513		$ 55,566	$ 74,577		$ 30,214	$ 64,392		$ 29,703	$ 335,629	$ 198,886	$ 191,046
South Korea [Member]
Concentration Risk [Line Items]
Revenues													289,418	181,771	168,267
China [Member]
Concentration Risk [Line Items]
Revenues													24,892	7,180	2,685
Japan [Member]
Concentration Risk [Line Items]
Revenues													8,542	4,310	16,542
Other Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues													2,438	1,849	2,334
Total Non-U.S. Locations [Member]
Concentration Risk [Line Items]
Revenues													325,290	195,110	189,828
UNITED STATES
Concentration Risk [Line Items]
Revenues													$ 10,339	$ 3,776	$ 1,218
[1] The Company receives significant license revenue in the second and fourth quarters; see Note 2 for further details.

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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).

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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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