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Summary of Significant Accounting Policies (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended |  | 12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended |
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Jul. 31, 2011 | Nov. 30, 2009 | Nov. 30, 2008 | Dec. 31, 2012 Segment | Dec. 31, 2011 | Dec. 31, 2010 | Jul. 06, 2011 | Dec. 31, 2012 Cash equivalents [Member] Maximum [Member] | Dec. 31, 2012 Marketable securities, current [Member] Minimum [Member] | Dec. 31, 2012 Marketable securities, non-current [Member] Maximum [Member] | Dec. 31, 2011 Series A [Member] | Jun. 30, 2012 Series A [Member] | Mar. 31, 2012 Series A [Member] | May 02, 2012 Series B [Member] | Dec. 31, 2011 Series B [Member] | Jun. 30, 2012 Series B [Member] | Mar. 31, 2012 Series B [Member] | Jul. 31, 2011 Reverse stock split [Member] | Jul. 06, 2011 Reverse stock split [Member]
Summary of significant accounting policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding shares of common stock |  |  |  | 37,506,305 | 22,427,955 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 139,000,000
Reduced common stock shares outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,900,000 |
Previous number of common shares authorized |  |  |  |  |  |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Shares authorized |  |  |  | 75,000,000 | 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 75,000,000
Investments with maturities |  |  |  |  |  |  |  | 90 days or less from the date of purchase | [1] | 365 days or less | greater than 365 days |  |  |  |  |  |  |  |  |
Term of warrant |  |  | 5 years |  |  |  |  |  |  |  |  | 5 years |  |  |  | 90 days |  |  |  |
Per share of common stock |  | $ 15.00 | $ 23.00 |  |  |  |  |  |  |  |  | $ 1.40 |  |  |  | $ 1.25 |  |  |  |
Impairment of goodwill |  |  |  | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of patent |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated other comprehensive income |  |  |  | 193,177 | 40,713 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Warrants exercised |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 2,700,000 |  |
Number of warrants issued on exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 2,700,000 | 2,700,000 |  |  |  |  |  |
Number of warrants expired by terms |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,300,000 |  |  |  |  |
Repurchase of common stock |  | 400,000 | 1,034,483 |  |  |  |  |  |  |  |  | 8,000,000 |  |  |  | 8,000,000 |  |  |  |
Summary of Significant Accounting Policies (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of Segments |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split | 1-for-10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reverse stock split, ratio | 0.1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  | (361,091,175) | (332,600,022) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  |  | 1,983,426 | 1,895,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible assets with finite useful lives |  |  |  | 1,823,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Intangible asset impaired and wrote off carrying value of the asset |  |  |  |  | 654,961 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of certain lab equipment |  |  |  | 28,000 |  | 63,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Written off unamortized amount of license agreement |  |  |  |  |  | $ 67,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock per unit |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants issued per unit |  |  |  | $ 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | In September 2012, we issued 24,753 shares of restricted common stock under the terms of an agreement with a developer of biological materials in return for certain product rights including an exclusive right of first offer to commercialize the developer's products as may be developed on or before April 18, 2017.

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