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Summary of Significant Accounting Policies - Additional Information (Detail)
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3 Months Ended | |
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Mar. 31, 2015
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Mar. 31, 2014
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| Summary Of Significant Accounting Policy [Line Items] | ||
| Number of vendors | 2 | |
| Supplier concentration risk | Inventory | ||
| Summary Of Significant Accounting Policy [Line Items] | ||
| Unrelated vendors, percentage | 16.00% | 19.00% |