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Marketable Securities and Fair Value Measurements (Details Textual)	1 Months Ended		3 Months Ended		9 Months Ended
	Mar. 31, 2012 $ / shares shares	Sep. 30, 2011 $ / shares shares	Sep. 30, 2015 USD ($) warrant shares	Sep. 30, 2014 USD ($) shares	Sep. 30, 2015 USD ($) warrant shares	Sep. 30, 2014 USD ($) shares	Jul. 01, 2015 USD ($)	Dec. 31, 2014 USD ($) shares
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Carryover basis							$ 0
Long-term asset associated with warrants			$ 89,000		$ 89,000
Decrease in fair value included in change in fair value of common stock warrants			$ 616,000	$ 176,000	$ 929,000	$ 331,000
Number of common stock issued related to warrants exercised (shares) | shares			0	97,865	0	2,169,342
Common stock warrants			$ 1,093,752		$ 1,093,752			$ 2,022,729
Onco Sec Common Stock Warrants [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Decrease in fair value included in change in fair value of common stock warrants			$ 98,000	$ 290,000	$ 461,000	$ 127,000
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Number of shares held in an affiliated entity (shares) | shares			1,644,155		1,644,155			1,644,155
Using Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Common Stock [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Investment owned (shares) | shares			395,758		395,758
Using Significant Unobservable Inputs (Level 3) [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Number of warrants received to purchase shares of common stock | warrant			2		2
Decrease in fair value included in change in fair value of common stock warrants					$ (928,977)
Using Significant Unobservable Inputs (Level 3) [Member] | First warrant [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Common stock purchase warrant (in shares) | shares		50,000
Term of the warrants in years		5 years
Exercise price of a five-year warrant ($ per share) | $ / shares		$ 24.00
Using Significant Unobservable Inputs (Level 3) [Member] | Second warrant [Member]
Marketable Securities and Fair Value Measurements (Textual) [Abstract]
Common stock purchase warrant (in shares) | shares	150,000
Term of the warrants in years	5 years
Exercise price of a five-year warrant ($ per share) | $ / shares	$ 20.00

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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