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Marketable Securities and Fair Value Measurements (Details Textual) | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2012 $ / shares shares | Sep. 30, 2011 $ / shares shares | Jun. 30, 2015 USD ($) warrant shares | Jun. 30, 2014 USD ($) shares | Jun. 30, 2015 USD ($) warrant shares | Jun. 30, 2014 USD ($) shares | Dec. 31, 2014 USD ($) shares
Marketable Securities and Fair Value Measurements (Textual) [Abstract] |  |  |  |  |  |  |
Long-term asset associated with warrants |  |  | $ 187,000 |  | $ 187,000 |  |
Decrease in fair value included in change in fair value of common stock warrants |  |  | $ 23,000 | $ 1,400,000 | $ (313,000) | $ 155,000 |
Number of common stock issued related to warrants exercised (shares) | shares |  |  | 0 | 170,455 | 0 | 2,071,475 |
Common stock warrants |  |  | $ 1,710,229 |  | $ 1,710,229 |  | $ 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 |  |  | $ 73,000 | $ (529,000) | $ 364,000 | $ 164,000 |
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 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 |  |  |  |  | $ (312,500) |  |
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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- Definition Exercise price of the warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column A + Details
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