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Major Customers - Narrative (Details) - Customer Concentration Risk - customer | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenues |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Number of customers | 2 | 2 |  |
Revenues | Customer No. 1 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 19.00% | 15.00% | 21.00% | 16.00%
Revenues | Customer No. 2 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 25.00% | 23.00% | 24.00% | 22.00%
Accounts Receivable | Customer No. 1 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 13.00% |  |  |
Accounts Receivable | Customer No. 2 |  |  |  |
Concentration Risk [Line Items] |  |  |  |
Concentration risk percentage | 57.00% |  |  |

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- Definition Concentration Risk, Number of Customers + References No definition available. + Details
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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=109250915&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=109250915&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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