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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, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share				2
Accounts Receivable
Revenue, Major Customer [Line Items]
Number of customers representing significant share			3		1
Landmark [Member] | Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share	1		1
Percentage share generated by major customers	16.00%	16.00%	13.00%	12.00%
Osram Opto [Member] | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers		10.00%		11.00%
Major Customer One | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			15.00%		12.00%
Major Customer Two | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			14.00%
Major Customer Three | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			11.00%
Top Five Major Customers | Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share	5	5	5	5
Percentage share generated by major customers	39.00%	39.00%	36.00%	37.00%

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+ References

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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

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