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Cash, Cash Equivalents and Marketable Securities (Tables) | 9 Months Ended
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Sep. 30, 2013
Investments in Debt Securities | Investments in debt securities consisted of the following at September 30, 2013:
|  | September 30, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 1,567,499 |  |  | $ | 313 |  |  | $ | (335 | ) |  | $ | 1,567,477 |
Corporate and other debt securities |  |  | 19,171,567 |  |  |  | 9,977 |  |  |  | (2,531 | ) |  |  | 19,179,013 |
|  |  | 20,739,066 |  |  |  | 10,290 |  |  |  | (2,866 | ) |  |  | 20,746,490 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 4,112,079 |  |  |  | 2,436 |  |  |  | (65 | ) |  |  | 4,114,450 |
Corporate and other debt securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 4,112,079 |  |  |  | 2,436 |  |  |  | (65 | ) |  |  | 4,114,450 |
Total |  | $ | 24,851,145 |  |  | $ | 12,726 |  |  | $ | (2,931 | ) |  | $ | 24,860,940 |
Investments in debt securities consisted of the following at December 31, 2012:
|  | December 31, 2012 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 2,000,897 |  |  | $ | 353 |  |  | $ | (7 | ) |  | $ | 2,001,243 |
Corporate and other debt securities |  |  | 8,835,098 |  |  |  | 8,854 |  |  |  | — |  |  |  | 8,843,952 |
|  |  | 10,835,995 |  |  |  | 9,207 |  |  |  | (7 | ) |  |  | 10,845,195 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 5,198,264 |  |  |  | 2,747 |  |  |  | — |  |  |  | 5,201,011 |
Corporate and other debt securities |  |  | 4,711,679 |  |  |  | 3,525 |  |  |  | (1,360 | ) |  |  | 4,713,844 |
|  |  | 9,909,943 |  |  |  | 6,272 |  |  |  | (1,360 | ) |  |  | 9,914,855 |
Total |  | $ | 20,745,938 |  |  | $ | 15,479 |  |  | $ | (1,367 | ) |  | $ | 20,760,050 |
Contractual Maturities of Debt Securities | The contractual maturities of debt securities at September 30, 2013 were as follows:
|  | Amortized Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 20,739,066 |  |  | $ | 20,746,490 |
Due in 1 to 2 years |  |  | 4,112,079 |  |  |  | 4,114,450 |
|  | $ | 24,851,145 |  |  | $ | 24,860,940 |

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