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Marketable Securities and Fair Value Measurements (Details 2) (Using Significant Unobservable Inputs (Level 3) [Member], USD $)
6 Months Ended
Jun. 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 (1,700)
Balance at end of year $ 265,500