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Concentrations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2016 Customer Vendor Supplier	Dec. 31, 2015 Customer Vendor Supplier	Dec. 31, 2014 Customer Supplier
Accounts Receivable | Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers	3	3
Accounts Receivable | Customer Concentration Risk | Three Customers
Concentration Risk [Line Items]
Concentration risk, percentage	92.00%	96.00%
Revenue | Customer Concentration Risk
Concentration Risk [Line Items]
Number of customers	4	4	3
Revenue | Customer Concentration Risk | Three Customers
Concentration Risk [Line Items]
Concentration risk, percentage			79.00%
Revenue | Customer Concentration Risk | Four Customers
Concentration Risk [Line Items]
Concentration risk, percentage	96.00%	94.00%
Accounts Payables | Supplier Concentration Risk
Concentration Risk [Line Items]
Number of vendors | Vendor	1	3
Accounts Payables | Supplier Concentration Risk | One Vendor
Concentration Risk [Line Items]
Concentration risk, percentage	35.00%
Accounts Payables | Supplier Concentration Risk | Three Vendors
Concentration Risk [Line Items]
Concentration risk, percentage		71.00%
Cost of Goods Sold | Supplier Concentration Risk
Concentration Risk [Line Items]
Number of suppliers | Supplier	2	4	3
Cost of Goods Sold | Supplier Concentration Risk | Two Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage	32.00%
Cost of Goods Sold | Supplier Concentration Risk | Four Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage		33.00%
Cost of Goods Sold | Supplier Concentration Risk | Three Suppliers
Concentration Risk [Line Items]
Concentration risk, percentage			45.00%

X

- Definition

Number of major customers.

+ References

No definition available.

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- Definition

Number of major suppliers.

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- Definition

Number of major vendors.

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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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- 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=51801978&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=49121117&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=51801978&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=49121117&loc=d3e13537-108611

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