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Financial Instruments | 3 Months Ended
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Mar. 31, 2013
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 |
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 |
At March 31, 2013, our investment in money market accounts are composed primarily of U.S. Treasury debt securities, which are classified as cash equivalents in the accompanying Consolidated Balance Sheet due to their short maturities. Our investment in short-term marketable securities are composed primarily of commercial paper and corporate debt securities. From time to time, we carry cash balances in excess of federally insured limits. Our cash balance at March 31, 2013 includes approximately 76,000 British pounds held by our U.K. subsidiary. We do not hold any investments that were in a material unrealized loss position as of March 31, 2013.

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