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Entity Level Information - Percentage of Total Revenues (Details) - Revenues - Customer Concentration | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Customer A |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 37.00% |
Customer B |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 14.00% | 38.00%
Customer C |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage | 13.00% | 6.00%
Customer D |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage |  | 17.00%
Customer E |  |
Revenues From External Customers And Long Lived Assets [Line Items] |  |
Concentration risk percentage |  | 10.00%

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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=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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- 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 No definition available. + Details
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