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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer	3 Months Ended				9 Months Ended		12 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Sep. 30, 2016	Jun. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share	2		1		2	2
Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share					1		1
Landmark [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	16.00%				12.00%	10.00%
IQE Group Customer [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			12.00%			11.00%
Osram Opto [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	10.00%				11.00%
Major Customer One [Member] | Accounts Receivable [Member]
Revenue, Major Customer [Line Items]
Percentage share generated by major customers					13.00%		13.00%
Top Five Major Customers [Member] | Revenue [Member]
Revenue, Major Customer [Line Items]
Number of customers representing significant share		5		5	5	5
Percentage share generated by major customers	39.00%		38.00%		37.00%	40.00%

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- Definition

Number of customers who represented significant share in the entity during the reporting period.

+ References

No definition available.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=64851502&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 20
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611

Reference 3: 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=64851502&loc=d3e6404-108592

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611

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- Definition

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.

+ References

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