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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share	2	2
Accounts Receivable
Revenue, Major Customer [Line Items]
Number of customers representing significant share	3	3
Landmark | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	11.00%	12.00%
Haisi Optoelectronics | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	12.00%
Osram Opto [Member] | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers		12.00%
Major Customer One | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	14.00%	17.00%
Major Customer Two | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	14.00%	12.00%
Major Customer Three | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	12.00%	10.00%
Top Five Major Customers | Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share	5	5
Percentage share generated by major customers	40.00%	38.00%

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- Definition

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

+ References

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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

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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.

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