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CONCENTRATION OF RISK (Tables)

3 Months Ended

Mar. 31, 2019

Risks And Uncertainties [Abstract]

Revenues and Accounts Receivable From Our Largest Customers

Revenues and accounts receivable from the Company's largest customers were as follows (in thousands):

		% of Revenues for the three months ended March 31,						Accounts Receivable as of
Customer		2019			2018			March 31, 2019
A		40%			16%			$	12,012
B		30%			55%			$	25,042
C		13%			11%			$	7,383

Revenues by Geographic Area

Revenues by geographic area are as follows (in thousands):

		Three Months Ended March 31,
Country		2019				2018
South Korea		$	61,499			$	30,774
China			20,778				8,852
Japan			1,846				875
Other non-U.S. locations			583				561
Total non-U.S. locations		$	84,706			$	41,062
United States			3,059				2,510
Total revenue		$	87,765			$	43,572

Long-Lived Assets (Net) by Geographic Area

Long-lived assets (net), by geographic area are as follows (in thousands):

		March 31, 2019				December 31, 2018
United States		$	75,160			$	64,560
Other			5,455				5,179
Total long-lived assets		$	80,615			$	69,739

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Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries.

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