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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - Customer concentration	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021 customer	Jun. 30, 2020 customer	Jun. 30, 2021 customer	Jun. 30, 2020 customer	Dec. 31, 2020 customer
Revenues
Revenue, Major Customer [Line Items]
Number of customers representing significant share	0	1	0	2
Accounts Receivable
Revenue, Major Customer [Line Items]
Number of customers representing significant share			1		2
Landmark | Revenues
Revenue, Major Customer [Line Items]
Percentage share generated by major customers		10.00%		13.00%
Osram | 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%		11.00%
Major Customer Two | Accounts Receivable
Revenue, Major Customer [Line Items]
Percentage share generated by major customers					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	31.00%	30.00%	27.00%	39.00%

X

- 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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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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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