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Warrant Liability (Details Textual) (USD $)
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6 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 1 Months Ended | 2 Months Ended | |||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Apr. 09, 2012
Institutional Investor [Member]
Common Stock [Member]
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Dec. 31, 2013
Series A Warrants [Member]
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Apr. 09, 2012
Series A Warrants [Member]
Institutional Investor [Member]
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Apr. 30, 2012
Series A Warrants [Member]
Institutional Investor [Member]
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Oct. 31, 2012
Series B Warrants [Member]
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Sep. 30, 2012
Series B Warrants [Member]
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Dec. 31, 2012
Series B Warrants [Member]
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Apr. 09, 2012
Series B Warrants [Member]
Institutional Investor [Member]
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Apr. 30, 2012
Series B Warrants [Member]
Institutional Investor [Member]
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Mar. 15, 2011
Deerfield Warrant [Member]
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Mar. 31, 2013
Deerfield Warrant [Member]
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Apr. 30, 2012
Deerfield Warrant [Member]
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| Class of Warrant or Right [Line Items] | |||||||||||||||||
| Warrants To Purchase Common Stock Shares | 6,517,648 | 6,517,648 | 6,517,648 | 6,000,000 | |||||||||||||
| Debt Instrument, Increase (Decrease), Net, Total | $ 7,500,000 | ||||||||||||||||
| Class of Warrant or Right Exercised During Period | 1,109,010 | 4,627,941 | 1,133,824 | 5,761,765 | 6,000,000 | ||||||||||||
| Proceeds from Warrant Exercises | $ 0 | $ 1,275,000 | $ 1,275,000 | $ 4,897,000 | $ 0 | $ 1,275,000 | $ 3,934,000 | $ 964,000 | |||||||||
| Class Of Warrant Or Right Subject To Expiry | 5,408,638 | ||||||||||||||||
| Investment Warrants Expiration Date | Apr. 30, 2018 | Oct. 31, 2012 | |||||||||||||||
| Class Of Warrant Or Right Expiry Term | six-year | six-month | |||||||||||||||
| Class Of Warrant Or Right Expired During Period | 755,883 | ||||||||||||||||
| Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 1.15 | $ 0.85 | $ 0.85 | $ 1.57 | $ 1.25 | ||||||||||||