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Employee Stock Options (Allocation of Stock Option Compensation Expense) (Details) (USD $)
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3 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
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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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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 366,640 | $ 86,155 | $ 390,617 | $ 333,466 |
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General and Administrative [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | 178,171 | 41,814 | 197,072 | 171,968 |
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Research and Development [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | 87,947 | 19,655 | 82,608 | 69,609 |
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Sales and Marketing [Member]
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] | ||||
| Stock-based compensation expense | $ 100,522 | $ 24,686 | $ 110,937 | $ 91,889 |