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Product Revenue by Geographic Location and Percentage of Total Product Revenue (Detail) (USD $) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 22,606,465 | $ 14,766,611 | $ 19,624,769 | $ 14,360,660 | $ 18,444,287 | $ 18,455,817 | $ 16,140,852 | $ 11,737,679 | $ 71,358,505 | $ 64,778,635 | $ 55,556,594
Percentage of revenue |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 57,904,290 | 48,366,140 | 38,313,594
Percentage of revenue |  |  |  |  |  |  |  |  | 81.10% | 74.70% | 69.00%
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,267,830 | 10,988,664 | 12,976,985
Percentage of revenue |  |  |  |  |  |  |  |  | 8.80% | 16.90% | 23.30%
Other |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 7,186,385 | $ 5,423,831 | $ 4,266,015
Percentage of revenue |  |  |  |  |  |  |  |  | 10.10% | 8.40% | 7.70%

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- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Article 5 + Details
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