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Financial Instruments | 9 Months Ended
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Sep. 30, 2012
Financial Instruments [Abstract] |
Financial Instruments | Note 2. Financial Instruments 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 |
September 30, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 281,065 |  |  | $ | — |  |  | $ | — |  |  | $ | 281,065 |
Cash equivalents |  |  | 15,431,623 |  |  |  | — |  |  |  | — |  |  |  | 15,431,623 |
Marketable debt securities, current |  |  | 6,031,219 |  |  |  | 516 |  |  |  | — |  |  |  | 6,031,735 |
Total cash, cash equivalents, and marketable securities |  | $ | 21,743,907 |  |  | $ | 516 |  |  | $ | — |  |  | $ | 21,744,423 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 291,093 |  |  | $ | — |  |  | $ | — |  |  | $ | 291,093 |
Cash equivalents |  |  | 13,020,168 |  |  |  | — |  |  |  | — |  |  |  | 13,020,168 |
Marketable debt securities, current |  |  | 3,283,209 |  |  |  | — |  |  |  | (2,618 | ) |  |  | 3,280,591 |
Total cash, cash equivalents, and marketable securities |  | $ | 16,594,470 |  |  | $ | — |  |  | $ | (2,618 | ) |  | $ | 16,591,852 |
Gross unrealized gains and losses on cash equivalents were not significant at September 30, 2012 and December 31, 2011. At September 30, 2012, our investment in money market accounts are composed primarily of U.S. Treasury debt securities, which are classified as cash equivalents in our Consolidated Balance Sheet due to their short maturities. Our investment in short-term marketable debt securities are composed primarily of commercial paper and corporate debt securities.

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