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Marketable Securities and Fair Value Measurements (Details 3) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes in fair value of the financial liabilities
Increase in fair value included in change in fair value of common stock warrants	$ 34,900,000	$ 1,100,000	$ 39,600,000	$ 987,000
Using Significant Unobservable Inputs (Level 3) [Member]
Changes in fair value of the financial liabilities
Balance at January 1, 2013			2,859,899
Record fair value of warrants issued			5,968,244
Increase in fair value included in change in fair value of common stock warrants			39,557,404
Change in classification from liability to stockholders' equity due to warrant exercises			(34,289,729)
Balance at September 30, 2013	$ 14,095,818		$ 14,095,818

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