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Stockholders’ Equity (Deficit) (Details Textual) (USD $) | 6 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 1 Months Ended | 2 Months Ended |  | 1 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Series A Warrants [Member] | Oct. 31, 2012 Series B Warrants [Member] | Sep. 30, 2012 Series B Warrants [Member] | Dec. 31, 2012 Series B Warrants [Member] | Mar. 15, 2011 Deerfield Warrant [Member] | Mar. 31, 2013 Deerfield Warrant [Member] | Apr. 30, 2012 Deerfield Warrant [Member] | Apr. 30, 2012 Series A And Series B Warrants [Member] | Apr. 30, 2013 Oxford [Member] | Nov. 30, 2013 Stock Purchase And Option Agreement With Affiliate [Member] | Sep. 30, 2012 Stock Purchase And Option Agreement With Affiliate [Member] | Dec. 31, 2012 Stock Purchase And Option Agreement With Affiliate [Member] License Revenue [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Apr. 30, 2012 Institutional Investor [Member] | Apr. 09, 2012 Institutional Investor [Member] Series A Warrants [Member] | Apr. 09, 2012 Institutional Investor [Member] Series B Warrants [Member] | Apr. 09, 2012 Institutional Investor [Member] Common Stock [Member]
Class of Warrant or Right [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,250,000 | 3,400,000 |  | 6,250,000 | 9,917,000 |  |  |  |
Proceeds from Issuance of Common Stock | $ (37,000) | $ 0 |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 | $ 4,250,000 |  |  |  |  |  |  |
Stock Purchase Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.80 | $ 1.25 |  |  |  |  |  |  |
Conversion of Stock, Shares Issued |  |  |  |  |  |  |  |  |  |  |  |  |  | 144,499 |  |  |  |  |  |  |  |  |
Class of Warrant or Right Exercised During Period |  |  |  |  |  | 1,109,010 | 4,627,941 | 1,133,824 | 5,761,765 |  | 6,000,000 |  |  | 287,356 |  |  |  |  |  |  |  |  |
Proceeds from Warrant Exercises | 0 | 1,275,000 | 1,275,000 | 4,897,000 | 0 | 1,275,000 | 3,934,000 | 964,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Increase (Decrease), Net, Total |  |  |  |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Premium Allocated to Fair Value Option Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |
Warrants To Purchase Common Stock Shares |  |  |  |  |  |  |  |  |  | 6,000,000 |  |  |  |  |  |  |  |  |  |  | 6,517,648 | 6,517,648 | 6,517,648
Proceeds from Issuance of Private Placement |  |  | 4,925,000 | 7,516,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,540,000 |  |  |
Payments of Stock Issuance Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 |  |  |
Warrants Not Settleable in Cash, Fair Value Disclosure |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,900,000 |  |  |  |  |  |  |  |  |  |
Premium Per Share under Option Agreement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.50 |  |  |  |  |  |
Sale of Stock, Price Per Share |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.80 |  |  |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights |  |  |  |  |  |  |  |  | $ 0.85 | $ 1.57 |  | $ 1.25 |  |  |  |  |  |  |  |  | $ 1.15 | $ 0.85 |

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- Definition The number of new shares issued in the conversion of stock in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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