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Major Customers - Additional Information (Detail) - Customer Concentration Risk [Member] - Customer	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Number of customers	1	2
Sales Revenue, Net [Member] | Customer 1 [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Customers accounted from total revenue	99.00%	61.40%
Sales Revenue, Net [Member] | Customer 2 [Member]
Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]
Customers accounted from total revenue		38.50%

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- Definition

Entity Wide Portfolio Carrying Amount, Major Customer [Line Items]

+ References

No definition available.

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- Definition

Number of customers.

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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

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