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Major Customers Data as Percentage of Total Revenues (Detail) - Revenue - Customer Concentration Risk	3 Months Ended				9 Months Ended
	Sep. 30, 2018		Sep. 30, 2017		Sep. 30, 2018		Sep. 30, 2017
Customer A
Revenue, Major Customer [Line Items]
Percentage of total revenues	16.00%		20.00%		16.00%		22.00%
Customer B
Revenue, Major Customer [Line Items]
Percentage of total revenues		[1]	18.00%		12.00%		17.00%
Customer C
Revenue, Major Customer [Line Items]
Percentage of total revenues	26.00%			[1]	16.00%			[1]
Customer D
Revenue, Major Customer [Line Items]
Percentage of total revenues		[1]	12.00%			[1]		[1]
Customer E
Revenue, Major Customer [Line Items]
Percentage of total revenues		[1]	21.00%			[1]		[1]
[1] Less than 10%

X

- 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
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-SubTopic 10
-Section 50
-Paragraph 21
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-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

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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.

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