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Marketable Securities and Fair Value Measurements (Details 2) (Using Significant Unobservable Inputs (Level 3) [Member], USD $) | 9 Months Ended
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Sep. 30, 2013
Using Significant Unobservable Inputs (Level 3) [Member] |
Change in fair value of the financial assets |
Balance at beginning of year | $ 267,200
Decrease in fair value included in change in fair value of common stock warrants | (22,300)
Balance at end of year | $ 244,900

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