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Concentrations - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2017 Customer Vendor Supplier | Dec. 31, 2016 Customer Vendor Supplier | Dec. 31, 2015 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 | 49.00% | 92.00% |
Revenue | Customer Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Number of customers | 4 | 4 | 4
Revenue | Customer Concentration Risk | Four Customers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 72.00% | 96.00% | 94.00%
Accounts Payables | Supplier Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Number of vendors | Vendor | 2 | 1 |
Accounts Payables | Supplier Concentration Risk | Two Vendors |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 28.00% |  |
Accounts Payables | Supplier Concentration Risk | One Vendor |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage |  | 35.00% |
Cost of Goods Sold | Supplier Concentration Risk |  |  |
Concentration Risk [Line Items] |  |  |
Number of suppliers | Supplier | 2 | 2 | 4
Cost of Goods Sold | Supplier Concentration Risk | Two Suppliers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage | 59.00% | 32.00% |
Cost of Goods Sold | Supplier Concentration Risk | Four Suppliers |  |  |
Concentration Risk [Line Items] |  |  |
Concentration risk, percentage |  |  | 33.00%

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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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