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SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue, Major Customer [Line Items]
Revenue	$ 31,046	$ 54,552	$ 61,351
Deferred revenue	2,474	2,339
Sales Revenue, Net | Customer Concentration Risk | Customer 1
Revenue, Major Customer [Line Items]
Revenue	13,080	33,360	20,980
Sales Revenue, Net | Customer Concentration Risk | Customer 2
Revenue, Major Customer [Line Items]
Revenue	6,990	8,690	16,310
Sales Revenue, Net | Customer Concentration Risk | Customer 3
Revenue, Major Customer [Line Items]
Revenue	4,400	7,000	12,530
Sales Revenue, Net | Customer Concentration Risk | Customer 4
Revenue, Major Customer [Line Items]
Revenue			9,000
Sales Revenue, Net | United States | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	20,070	50,760	37,850
Sales Revenue, Net | South Korea | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue			20,980
Sales Revenue, Net | Other | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue	$ 4,400	$ 3,690	$ 1,870

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- Definition

The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 5: http://www.xbrl.org/2003/role/presentationRef
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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