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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 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	15.00%		13.00%	10.00%
Haisi Optoelectronics | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers	18.00%		15.00%
Osram Opto [Member] | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers				11.00%
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			11.00%		12.00%
Major Customer Three | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers			10.00%		10.00%
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	48.00%	33.00%	43.00%	35.00%

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- Definition

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

+ References

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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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