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Cash, Cash Equivalents and Marketable Securities (Tables) | 3 Months Ended
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Mar. 31, 2014
Investments in Money Market Funds and Marketable Securities | Investments in money market funds and marketable securities consisted of the following at March 31, 2014:
|  | March 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 9,529,909 |  |  | $ | 2,415 |  |  | $ | (120 | ) |  | $ | 9,532,204 |
Corporate and other debt securities |  |  | 12,016,880 |  |  |  | 4,043 |  |  |  | (1,729 | ) |  |  | 12,019,194 |
|  |  | 21,546,789 |  |  |  | 6,458 |  |  |  | (1,849 | ) |  |  | 21,551,398 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 8,918,120 |  |  |  | 516 |  |  |  | (8,279 | ) |  |  | 8,910,357 |
Corporate and other debt securities |  |  | 1,994,104 |  |  |  | 1,915 |  |  |  | (1,858 | ) |  |  | 1,994,161 |
|  |  | 10,912,224 |  |  |  | 2,431 |  |  |  | (10,137 | ) |  |  | 10,904,518 |
Total |  | $ | 32,459,013 |  |  | $ | 8,889 |  |  | $ | (11,986 | ) |  | $ | 32,455,916 |
Investments in money market funds and marketable securities consisted of the following at December 31, 2013:
|  | December 31, 2013 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 8,165,464 |  |  | $ | 435 |  |  | $ | (630 | ) |  | $ | 8,165,269 |
Corporate and other debt securities |  |  | 13,626,690 |  |  |  | 3,636 |  |  |  | (2,045 | ) |  |  | 13,628,281 |
|  |  | 21,792,154 |  |  |  | 4,071 |  |  |  | (2,675 | ) |  |  | 21,793,550 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 11,599,415 |  |  |  | 466 |  |  |  | (7,034 | ) |  |  | 11,592,847 |
Corporate and other debt securities |  |  | 625,882 |  |  |  | 100 |  |  |  | (227 | ) |  |  | 625,755 |
|  |  | 12,225,297 |  |  |  | 566 |  |  |  | (7,261 | ) |  |  | 12,218,602 |
Total |  | $ | 34,017,451 |  |  | $ | 4,637 |  |  | $ | (9,936 | ) |  | $ | 34,012,152 |
Contractual Maturities of Money Market Funds and Marketable Securities | The contractual maturities of money market funds and marketable securities at March 31, 2014 were as follows:
|  | Amortized Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 21,546,789 |  |  | $ | 21,551,398 |
Due in 1 to 2 years |  |  | 10,912,224 |  |  |  | 10,904,518 |
|  | $ | 32,459,013 |  |  | $ | 32,455,916 |

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