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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - Customer concentration | 3 Months Ended
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Mar. 31, 2021 customer | Mar. 31, 2020 customer
Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 0 | 2
Percentage share generated by major customers | 10.00% |
Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 2 | 3
Landmark | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers |  | 17.00%
Osram | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers |  | 15.00%
Major Customer One | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 14.00% | 20.00%
Major Customer Two | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers | 10.00% | 13.00%
Major Customer Three | Accounts Receivable |  |
Revenue, Major Customer [Line Items] |  |
Percentage share generated by major customers |  | 12.00%
Top Five Major Customers | Revenues |  |
Revenue, Major Customer [Line Items] |  |
Number of customers representing significant share | 5 | 5
Percentage share generated by major customers | 26.00% | 49.00%

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13531-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13537-108611 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592 + Details
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