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SUPPLEMENTAL FINANCIAL INFORMATION - Schedules of Components of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Supplemental Financial Information [Line Items]
Revenue	$ 31,046	$ 54,552	$ 61,351
Other | Geographic Concentration Risk | Sales Revenue, Net
Supplemental Financial Information [Line Items]
Revenue	$ 4,400	$ 3,690	$ 1,870

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[Line Items] for Supplemental Financial Information [Table]

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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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