Quarterly report pursuant to sections 13 or 15(d)

Debt Instruments (Senior Notes Payable and Warrants) (Details)

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Debt Instruments (Senior Notes Payable and Warrants) (Details) (USD $)
 3 Months Ended 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
May 31, 2012
Senior Notes Payable [Member]
Oct. 31, 2011
Senior Notes Payable [Member]
Apr. 30, 2011
Senior Notes Payable [Member]
Mar. 31, 2014
Senior Notes Payable [Member]
Dec. 31, 2013
Senior Notes Payable [Member]
Dec. 31, 2011
Senior Notes Payable [Member]
Dec. 31, 2013
Senior Notes Payable [Member]
Series A [Member]
Debt Instrument [Line Items]                  
Issuance of notes payable     $ 3,500,000 $ 500,000 $ 1,000,000        
Principal amount             5,000,000 1,500,000  
Term             30 months    
Number of shares called by warrants                 128,570
Outstanding principal           0 2,344,302    
Interest expense $ 426,603 $ 639,113       $ 421,793 $ 631,098