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Segment Information and Foreign Operations - Concentration of Credit Risk (Details) - customer | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Revenues |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of customers representing significant share | 2 | 1 |
Accounts Receivable |  |  |
Revenue, Major Customer [Line Items] |  |  |
Number of customers representing significant share | 1 |  | 1
Landmark [Member] | 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% | 11.00% |
Major Customer One | Accounts Receivable |  |  |
Revenue, Major Customer [Line Items] |  |  |
Percentage share generated by major customers | 13.00% |  | 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 | 38.00% | 35.00% |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6351-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13531-108611 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=64851502&loc=d3e6404-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 21 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13537-108611 + Details
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