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Subsequent Events (Details) (USD $) | 12 Months Ended | 1 Months Ended |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 3 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Mar. 17, 2014 Subsequent Event [Member] | Mar. 07, 2014 Plymouth Meeting, Pennsylvania [Member] Subsequent Event [Member] | Mar. 17, 2014 Plymouth Meeting, Pennsylvania [Member] Minimum [Member] Subsequent Event [Member] | Mar. 17, 2014 Plymouth Meeting, Pennsylvania [Member] Maximum [Member] Subsequent Event [Member] | Dec. 31, 2013 Common Stock [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 31, 2011 Common Stock [Member] | Mar. 04, 2014 Common Stock [Member] Underwritten public offering [Member] Subsequent Event [Member] | Mar. 04, 2014 Common Stock [Member] Underwritten Public Offering Overallotment Option [Member] Subsequent Event [Member] | Sep. 30, 2014 Scenario, Forecast [Member] Plymouth Meeting, Pennsylvania [Member]
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock shares issued |  |  |  |  |  |  |  | 15,700,668 | 9,344,611 | 1,028,905 | 21,810,900 | 2,844,900 |
Public offering price |  |  |  |  |  |  |  |  |  |  | $ 2.90 |  |
Proceeds from issuance of common stock and warrants, net of issuance costs | $ 32,883,705 | $ 5,325,141 | $ 27,994,601 |  |  |  |  |  |  |  | $ 59,200,000 |  |
Initial lease term |  |  |  |  |  |  |  |  |  |  |  |  | 11 years 6 months
Monthly payments under the lease |  |  |  |  |  | 0 | 58,000 |  |  |  |  |  |
Security deposit |  |  |  |  | 49,000 |  |  |  |  |  |  |  |
Number of common stock from warrants and stock options exercised |  |  |  | 7,619,039 |  |  |  |  |  |  |  |  |
Proceeds from warrants and stock options exercised |  |  |  | $ 10,200,000 |  |  |  |  |  |  |  |  |

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