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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