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Significant Concentrations (Tables)

12 Months Ended

Dec. 31, 2017

Sales Revenue, Net [Member]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

The Company depends on two customers for majority of its revenues and the loss of, or a significant reduction in orders would significantly reduce the Company’s revenues and adversely impact the Company’s operating results. The Company’s sales to these two customers as a percentage of revenues are as follows:

		Year Ended December 31,
		2015			2016			2017
Customer A and its affiliates			20.1	%		22.4	%		25.8	%
Customer B and its affiliates			21.1	%		15.2	%		15.5	%

Accounts Receivable [Member]

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

The percentage of the Company’s accounts receivable accounted by customers, those representing more than 10% of total accounts receivable balance, is summarized as follows:

		December 31,
		2016			2017
Customer A and its affiliates			29.2	%		32.6	%
Customer B and its affiliates			19.3	%		15.5	%

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- Definition

Tabular disclosure of the nature of a concentration, a benchmark to which it is compared, and the percentage that the risk is to the benchmark.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6351-108592

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13537-108611

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13531-108611

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 21
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6442-108592

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 16
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6327-108592

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84177426&loc=d3e6404-108592

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