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Cash, Cash Equivalents and Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2015
Investments in Money Market Funds and Marketable Securities | Investments in money market funds and marketable securities consisted of the following at June 30, 2015:
|  | June 30, 2015 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 12,092,702 |  |  | $ | 4,006 |  |  | $ | (349 | ) |  | $ | 12,092,359 |
Corporate and other debt securities |  |  | 11,060,445 |  |  |  | 1,394 |  |  |  | (3,378 | ) |  |  | 11,058,461 |
|  |  | 23,153,147 |  |  |  | 5,400 |  |  |  | (3,727 | ) |  |  | 23,154,820 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 1,223,276 |  |  |  | 272 |  |  |  | (80 | ) |  |  | 1,223,468 |
Corporate and other debt securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
|  |  | 1,223,276 |  |  |  | 272 |  |  |  | (80 | ) |  |  | 1,223,468 |
Total |  | $ | 24,376,423 |  |  | $ | 5,672 |  |  | $ | (3,807 | ) |  | $ | 24,378,288 |
Investments in money market funds and marketable securities consisted of the following at December 31, 2014:
|  | December 31, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 12,716,167 |  |  | $ | 2,174 |  |  | $ | (2,072 | ) |  | $ | 12,716,269 |
Corporate and other debt securities |  |  | 10,373,332 |  |  |  | 4,229 |  |  |  | (3,621 | ) |  |  | 10,373,940 |
|  |  | 23,089,499 |  |  |  | 6,403 |  |  |  | (5,693 | ) |  |  | 23,090,209 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 1,227,843 |  |  |  | — |  |  |  | (207 | ) |  |  | 1,227,636 |
Corporate and other debt securities |  |  | 2,326,066 |  |  |  | — |  |  |  | (3,492 | ) |  |  | 2,322,574 |
|  |  | 3,553,909 |  |  |  | — |  |  |  | (3,699 | ) |  |  | 3,550,210 |
Total |  | $ | 26,643,408 |  |  | $ | 6,403 |  |  | $ | (9,392 | ) |  | $ | 26,640,419 |
Contractual Maturities of Money Market Funds and Marketable Securities | The contractual maturities of money market funds and marketable securities at June 30, 2015 were as follows:
|  | Amortized Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 23,153,147 |  |  | $ | 23,154,820 |
Due in 1 to 2 years |  |  | 1,223,276 |  |  |  | 1,223,468 |
|  | $ | 24,376,423 |  |  | $ | 24,378,288 |

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