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SUPPLEMENTAL FINANCIAL INFORMATION - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue, Major Customer [Line Items]
Revenue	$ 3,043	$ 451	$ 26,973	$ 1,254	$ 3,908	$ 5,499	$ 17,883	$ 3,756	$ 31,721	$ 31,046	$ 54,552
Deferred revenue	$ 2,724				$ 2,474				2,724	2,474
Sales Revenue, Net | Customer Concentration Risk | Customer 1
Revenue, Major Customer [Line Items]
Revenue									24,520	13,080	33,360
Sales Revenue, Net | Customer Concentration Risk | Customer 2
Revenue, Major Customer [Line Items]
Revenue									5,030	6,990	8,690
Sales Revenue, Net | Customer Concentration Risk | Customer 3
Revenue, Major Customer [Line Items]
Revenue									1,240	4,400	7,000
Sales Revenue, Net | United States | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue									25,760	20,070	50,760
Sales Revenue, Net | Other | Geographic Concentration Risk
Revenue, Major Customer [Line Items]
Revenue									$ 5,030	$ 4,400	$ 3,690

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)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Topic 605
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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
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-Section S99
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