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Major Customers - Narrative (Details) - Customer Concentration Risk - customer |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Revenues |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Number of customers |  | 2 | 2 |  |
Revenues | Customer No. 1 |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage |  | 23.00% | 17.00% | 22.00% | 16.00%
Revenues | Customer No. 2 |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage |  | 16.00% | 13.00% | 16.00% | 12.00%
Accounts Receivable | Customer No. 1 |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage | 57.00% |  |  |  |
Accounts Receivable | Customer No. 2 |  |  |  |  |
Concentration Risk [Line Items] |  |  |  |  |
Concentration risk percentage | 13.00% |  |  |  |

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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=84177426&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=77997519&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=84177426&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=77997519&loc=d3e13537-108611 + Details
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