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.

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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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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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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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SEGMENT INFORMATION (Details) $ in Thousands	3 Months Ended								12 Months Ended
SEGMENT INFORMATION (Details) $ in Thousands	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Segment information
Number of operating segments \| segment									1
Identifiable assets	$ 349,197				$ 305,828				$ 349,197	$ 305,828
Revenues derived from foreign subsidiaries	92,998	$ 94,653	$ 86,661	$ 92,382	87,925	$ 96,633	$ 92,630	$ 93,896	$ 366,694	$ 371,084	$ 310,611
Total Revenue
Segment information
Percentage of concentration risk									15.00%	16.00%	19.00%
Trade receivables
Segment information
Percentage of concentration risk									22.00%	17.00%
Outside the United States
Segment information
Identifiable assets	$ 133,466				$ 95,777				$ 133,466	$ 95,777
Revenues derived from foreign subsidiaries									171,847	159,365	$ 146,835
Wholly owned foreign subsidiaries
Segment information
Revenues derived from foreign subsidiaries									$ 152,491	$ 126,737	$ 126,104