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For an unclassified balance sheet, a valuation allowance for receivables due a company that are expected to be uncollectible.

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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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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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Long-lived assets other than financial instruments, long-term customer relationships of a financial institution, mortgage and other servicing rights, deferred policy acquisition costs, and deferred tax assets.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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SIGNIFICANT CUSTOMERS, CONCENTRATION OF CREDIT RISK AND GEOGRAPHIC INFORMATION (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment customer	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($) customer
Significant Customers, Concentration of Credit Risk and Geographic Information
Number of operating segments \| segment			1
Revenue, net	$ 1,920	$ 2,649	$ 7,176	$ 8,797
Allowance for doubtful accounts	$ 0		$ 0		$ 32
Net revenue \| Customer Concentration Risk \| Customer A
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	19.00%	18.00%	18.00%	16.00%
Net revenue \| Customer Concentration Risk \| Customer B
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	12.00%	20.00%	14.00%	14.00%
Net revenue \| Customer Concentration Risk \| Customer C
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)	16.00%		11.00%
Net revenue \| Customer Concentration Risk \| Customer D
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)				16.00%
Net revenue \| Geographic Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	$ 1,920	$ 2,649	$ 7,176	$ 8,797
Net revenue \| Geographic Concentration Risk \| United states
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	717	1,249	3,138	4,238
Net revenue \| Geographic Concentration Risk \| Asia and Middle East
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	1,077	1,156	3,438	3,480
Net revenue \| Geographic Concentration Risk \| Europe and other
Significant Customers, Concentration of Credit Risk and Geographic Information
Revenue, net	126	$ 244	$ 600	$ 1,079
Accounts receivable \| Credit Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Number of customers \| customer			2		3
Accounts receivable \| Credit Concentration Risk \| Customer One
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)			45.00%		35.00%
Accounts receivable \| Credit Concentration Risk \| Customer Two
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)			25.00%		10.00%
Accounts receivable \| Credit Concentration Risk \| Customer Three
Significant Customers, Concentration of Credit Risk and Geographic Information
Concentration risk (as a percent)					10.00%
Assets \| Geographic Concentration Risk
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	728		$ 728		$ 594
Assets \| Geographic Concentration Risk \| United states
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	145		145		103
Assets \| Geographic Concentration Risk \| Asia
Significant Customers, Concentration of Credit Risk and Geographic Information
Total long-lived assets	$ 583		$ 583		$ 491