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Quarterly Financial Data (Unaudited) (Tables) | 12 Months Ended
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Dec. 31, 2012
Quarterly Financial Data |
|  | Quarter ended |  |  | Quarter ended |  |  | Quarter ended |  |  | Quarter ended |
Year 2012 |  | December 31, |  |  | September 30, |  |  | June 30, |  |  | March 31, |
Product revenue |  | $ | 21,459,124 |  |  | $ | 14,055,440 |  |  | $ | 18,882,277 |  |  | $ | 13,613,328 |
Total revenue |  |  | 22,606,465 |  |  |  | 14,766,611 |  |  |  | 19,624,769 |  |  |  | 14,360,660 |
Cost of product revenue |  |  | 7,269,886 |  |  |  | 7,221,028 |  |  |  | 8,084,226 |  |  |  | 6,413,481 |
Gross profit on product revenue |  |  | 14,189,238 |  |  |  | 6,834,412 |  |  |  | 10,798,051 |  |  |  | 7,199,847 |
Net income |  | $ | 4,463,223 |  |  | $ | 1,645,250 |  |  | $ | 3,736,868 |  |  | $ | 1,912,119 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.33 |  |  | $ | 0.12 |  |  | $ | 0.28 |  |  | $ | 0.15 |
Basic common shares outstanding |  |  | 13,324,942 |  |  |  | 13,287,463 |  |  |  | 13,262,023 |  |  |  | 13,162,824 |
Diluted net income per share |  | $ | 0.31 |  |  | $ | 0.11 |  |  | $ | 0.26 |  |  | $ | 0.14 |
Diluted common shares outstanding |  |  | 14,299,211 |  |  |  | 14,459,154 |  |  |  | 14,443,794 |  |  |  | 14,089,946 |
|  | Quarter ended |  |  | Quarter ended |  |  | Quarter ended |  |  | Quarter ended |
Year 2011 |  | December 31, |  |  | September 30, |  |  | June 30, |  |  | March 31, |
Product revenue |  | $ | 17,725,546 |  |  | $ | 17,756,000 |  |  | $ | 15,414,681 |  |  | $ | 11,060,159 |
Total revenue |  |  | 18,444,287 |  |  |  | 18,455,817 |  |  |  | 16,140,852 |  |  |  | 11,737,679 |
Cost of product revenue |  |  | 7,128,450 |  |  |  | 7,394,922 |  |  |  | 6,655,804 |  |  |  | 5,604,562 |
Gross profit on product revenue |  |  | 10,597,096 |  |  |  | 10,361,078 |  |  |  | 8,758,877 |  |  |  | 5,455,597 |
Net income |  | $ | 2,883,110 |  |  | $ | 2,976,518 |  |  | $ | 2,282,641 |  |  | $ | 324,412 |
Per common share information: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic net income per share |  | $ | 0.22 |  |  | $ | 0.23 |  |  | $ | 0.18 |  |  | $ | 0.03 |
Basic common shares outstanding |  |  | 13,122,004 |  |  |  | 12,817,910 |  |  |  | 12,725,216 |  |  |  | 12,688,819 |
Diluted net income per share |  | $ | 0.21 |  |  | $ | 0.22 |  |  | $ | 0.17 |  |  | $ | 0.02 |
Diluted common shares outstanding |  |  | 13,804,806 |  |  |  | 13,765,533 |  |  |  | 13,739,836 |  |  |  | 13,744,710 |

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=20225539&loc=d3e1280-108306 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration