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Financial Instruments | 12 Months Ended
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Dec. 31, 2012
Financial Instruments [Abstract] |
Financial Instruments | Note 2. Financial Instruments Cash, cash equivalents and marketable securities The following table summarizes the fair value of our cash, cash equivalents and available-for-sale securities held in our investment portfolio:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 254,267 |  |  | $ | — |  |  | $ | — |  |  | $ | 254,267 |
Cash equivalents (money market accounts) |  |  | 8,217,259 |  |  |  | — |  |  |  | (252 | ) |  |  | 8,217,007 |
Marketable debt 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 |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  | $ | 291,093 |  |  | $ | — |  |  | $ | — |  |  | $ | 291,093 |
Cash equivalents (money market accounts) |  |  | 13,020,168 |  |  |  | — |  |  |  | — |  |  |  | 13,020,168 |
Marketable equity 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 |
At December 31, 2012, 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 debt 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 December 31, 2012 includes approximately $22,000 held in British pounds by our U.K. subsidiary. We do not hold any investments that were in a material unrealized loss position as of December 31, 2012.

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