Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.7-03(a)(12))
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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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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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Aggregate revenue during the period from the sale of goods in the normal course of business, after deducting returns, allowances and discounts.

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-Name Accounting Standards Codification
-Topic 225
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-Paragraph 2
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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended		12 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Segment information
Number of operating segments \| segment	1
Identifiable assets	$ 214,773		$ 187,922
Total Revenue
Segment information
Percentage of concentration risk	21.00%	19.00%
Trade receivables
Segment information
Percentage of concentration risk	23.00%		15.00%
Outside the United States
Segment information
Revenues derived from foreign subsidiaries	$ 36,302	$ 28,170
Wholly owned foreign subsidiaries
Segment information
Revenues derived from foreign subsidiaries	32,405	$ 25,285
Identifiable assets	$ 89,537		$ 84,652