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Financial Instruments (Tables) | 3 Months Ended
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Mar. 31, 2013
Financial Instruments [Abstract] |
Available-for-sale securities held in investment portfolio | The following table summarizes the fair value of our cash, cash equivalents and available-for-sale marketable securities held in our current investment portfolio:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized (Losses) |  |  | Fair Value |
March 31, 2013 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 622,831 |  |  | $ | — |  |  | $ | — |  |  | $ | 622,831 |
Cash equivalents |  |  | 6,608,247 |  |  |  | — |  |  |  | — |  |  |  | 6,608,247 |
Marketable securities, current |  |  | 9,818,948 |  |  |  | — |  |  |  | (1,439 | ) |  |  | 9,817,509 |
Total cash, cash equivalents, and marketable securities |  | $ | 17,050,026 |  |  | $ | — |  |  | $ | (1,439 | ) |  | $ | 17,048,587 |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 254,267 |  |  | $ | — |  |  | $ | — |  |  | $ | 254,267 |
Cash equivalents |  |  | 8,217,259 |  |  |  | — |  |  |  | (252 | ) |  |  | 8,217,007 |
Marketable securities, current |  |  | 13,901,782 |  |  |  | — |  |  |  | (1,104 | ) |  |  | 13,900,678 |
Total cash, cash equivalents, and marketable securities |  | $ | 22,373,308 |  |  | $ | — |  |  | $ | (1,356 | ) |  | $ | 22,371,952 |

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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