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Debt Instruments (Senior Notes Payable and Warrants) (Details) (USD $)
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1 Months Ended | 3 Months Ended | 12 Months Ended | |||||
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May 30, 2012
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Oct. 31, 2011
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Apr. 30, 2011
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Mar. 31, 2014
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Mar. 31, 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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| Debt Instrument [Line Items] | ||||||||
| Proceeds from issuance of notes payable and warrants, net of issuance costs | $ 3,500,000 | |||||||
| Interest expense | 426,603 | 639,113 | 1,726,455 | 736,346 | ||||
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Senior Notes Payable [Member]
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| Debt Instrument [Line Items] | ||||||||
| Proceeds from issuance of notes payable and warrants, net of issuance costs | 3,500,000 | 500,000 | 1,000,000 | 3,500,000 | 1,500,000 | |||
| Principal amount | 5,000,000 | 1,500,000 | ||||||
| Term | 30 months | 6 months | ||||||
| Number of shares called by warrants | 19,337 | |||||||
| Outstanding principal | 0 | 2,344,302 | ||||||
| Interest expense | $ 421,793 | $ 631,098 | $ 447,570 | $ 379,312 | ||||
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Senior Notes Payable [Member] | Series A [Member]
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| Debt Instrument [Line Items] | ||||||||
| Number of shares called by warrants | 128,570 | |||||||