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Cash, Cash Equivalents and Marketable Securities (Tables) | 6 Months Ended
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Jun. 30, 2014
Investments in Money Market Funds and Marketable Securities | Investments in money market funds and marketable securities consisted of the following at June 30, 2014:
|  | June 30, 2014 |
|  | Amortized Cost |  |  | Gross Unrealized Gain |  |  | Gross Unrealized Loss |  |  | Fair Value |
Marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  | $ | 7,286,273 |  |  | $ | 2,220 |  |  | $ | (119 | ) |  | $ | 7,288,374 |
Corporate and other debt securities |  |  | 8,980,820 |  |  |  | 2,053 |  |  |  | (730 | ) |  |  | 8,982,143 |
|  |  | 16,267,093 |  |  |  | 4,273 |  |  |  | (849 | ) |  |  | 16,270,517 |
Long-term marketable securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government and agency securities |  |  | 7,365,077 |  |  |  | 3,144 |  |  |  | (888 | ) |  |  | 7,367,333 |
Corporate and other debt securities |  |  | 4,529,989 |  |  |  | 1,847 |  |  |  | (2,220 | ) |  |  | 4,529,616 |
|  |  | 11,895,066 |  |  |  | 4,991 |  |  |  | (3,108 | ) |  |  | 11,896,949 |
Total |  | $ | 28,162,159 |  |  | $ | 9,264 |  |  | $ | (3,957 | ) |  | $ | 28,167,466 |
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 June 30, 2014 were as follows:
|  | Amortized Cost |  |  | Fair Value |
Due in 1 year or less |  | $ | 16,267,093 |  |  | $ | 16,270,517 |
Due in 1 to 2 years |  |  | 11,895,066 |  |  |  | 11,896,949 |
|  | $ | 28,162,159 |  |  | $ | 28,167,466 |

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