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Stock-Based Compensation (Details Textual) (USD $)
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12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Dec. 31, 2012
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Oct. 25, 2012
Warrant [Member]
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Mar. 15, 2012
Warrant [Member]
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Dec. 20, 2011
Warrant [Member]
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Dec. 31, 2013
Warrant [Member]
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Dec. 31, 2012
Warrant [Member]
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Dec. 31, 2013
Epitope [Member]
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Dec. 31, 2013
General and Administrative Expenses and Research and Development Expense [Member]
Warrant [Member]
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Dec. 31, 2012
General and Administrative Expenses and Research and Development Expense [Member]
Warrant [Member]
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Dec. 31, 2013
Employees And Directors [Member]
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Dec. 31, 2012
Employees And Directors [Member]
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Dec. 31, 2013
Employee [Member]
General and Administrative Expenses and Research and Development Expense [Member]
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Dec. 31, 2012
Employee [Member]
General and Administrative Expenses and Research and Development Expense [Member]
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Dec. 31, 2013
Consultant [Member]
General and Administrative Expenses and Research and Development Expense [Member]
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Dec. 31, 2012
Consultant [Member]
General and Administrative Expenses and Research and Development Expense [Member]
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Dec. 31, 2013
2001 Stock Plan [Member]
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Dec. 31, 2001
2001 Stock Plan [Member]
Maximum [Member]
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Dec. 31, 2013
2007 Stock Plan [Member]
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Mar. 20, 2007
2007 Stock Plan [Member]
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Dec. 31, 2007
2007 Stock Plan [Member]
Maximum [Member]
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Dec. 31, 2013
2010 Stock Plan [Member]
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Nov. 02, 2010
2010 Stock Plan [Member]
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Dec. 31, 2013
2010 Stock Plan [Member]
Maximum [Member]
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Dec. 31, 2013
2010 Stock Plan [Member]
Minimum [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number | 50,000 | 953,507 | 443,573 | 2,500,000 | 2,512,500 | 3,000,000 | |||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross | 222,500 | 222,500 | 2,075,000 | 953,507 | 250,000 | 443,573 | 250,000 | 2,512,500 | 6,000,000 | 3,000,000 | |||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Fair Value | $ 350,000 | $ 4,500,000 | |||||||||||||||||||||||
| Allocated Share-based Compensation Expense | 0 | 271,000 | 1,300,000 | 1,400,000 | 324,000 | 216,000 | |||||||||||||||||||
| Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options | 1,600,000 | ||||||||||||||||||||||||
| Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options | 231,000 | 127,000 | |||||||||||||||||||||||
| Issuance of Warrants to Purchase of Common Stock | 635,855 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Outstanding, Weighted Average Remaining Contractual Terms | 5 years | ||||||||||||||||||||||||
| Warrants Exercise Price Per Share | $ 1.60 | ||||||||||||||||||||||||
| Investment Warrants Expiration Date | Oct. 25, 2017 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Exercisable Number | 250,000 | 100,000 | |||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Vested and Expected to Vest Outstanding, Number | 50,000 | ||||||||||||||||||||||||
| Warrants Exercisable Price Per Share | $ 2.20 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Warrants, Exercisable in Period | 2 years | 5 years | |||||||||||||||||||||||
| Issuance of Warrants Expenses Recognized | 0 | 63,000 | |||||||||||||||||||||||
| Fair Value Warrants | $ 200,000 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number | 40,000 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ 0.001 | ||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term | 4 years 6 months | ||||||||||||||||||||||||