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SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Revenue	$ 54,552	$ 61,351	$ 54,552	$ 61,351	$ 46,253
Deferred revenue	$ 2,339	$ 2,165	2,339	2,165
Sales Revenue, Net | Customer Concentration Risk | Customer 1
Revenue, Major Customer [Line Items]
Revenue			33,360	20,980	20,660
Sales Revenue, Net | Customer Concentration Risk | Customer 2
Revenue, Major Customer [Line Items]
Revenue			8,690	16,310	8,570
Sales Revenue, Net | Customer Concentration Risk | Customer 3
Revenue, Major Customer [Line Items]
Revenue			7,000	12,530	16,530
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			50,760	37,850	25,590
Sales Revenue, Net | South Korea | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue				20,980	$ 20,660
Sales Revenue, Net | Other | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue			$ 3,690	$ 1,870

X

- 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
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6935-107765

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 605
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 13.A.4(a).Q1)
-URI http://asc.fasb.org/extlink&oid=27012821&loc=d3e214044-122780

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 13
-Section A

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+ References

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
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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