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Loan Payable (Tables) | 6 Months Ended
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Jun. 30, 2013
Warrant Agreement 2008 [Member] |
Assumptions Used for Black-Scholes Option Pricing Model | The assumptions used for the Black-Scholes option pricing model are as follows:
|  | To Calculate Fair Value of Warrant Liability at |
|  | June 30, 2013 |  |  | December 31, 2012 |
Expected life (years) |  |  | 1.0 |  |  |  | 1.4 |
Risk-free interest rate |  |  | 0.1 | % |  |  | 0.2 | %
Expected volatility |  |  | 58.1 | % |  |  | 108.2 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At June 30, 2013 |  |  | At December 31, 2012 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2008 |  | $ | 0 |  |  | $ | 44,628 |  |  | $ | (44,628 | )
Warrant Agreement 2009 [Member] |
Assumptions Used for Black-Scholes Option Pricing Model | The assumptions used for the Black-Scholes option pricing model are as follows:
|  | To Calculate Fair Value of Warrant Liability at |
|  | June 30, 2013 |  |  | December 31, 2012 |
Expected life (years) |  |  | 1.8 |  |  |  | 2.3 |
Risk-free interest rate |  |  | 0.3 | % |  |  | 0.3 | %
Expected volatility |  |  | 96.7 | % |  |  | 94.5 | %
Expected dividend yield |  |  | 0 | % |  |  | 0 | %
|  | At June 30, 2013 |  |  | At December 31, 2012 |  |  | Change in Fair Value of Warrant Liability |
Fair value of liability for warrants issued in 2009 |  | $ | 42,192 |  |  | $ | 63,340 |  |  | $ | (21,148 | )
Silicon Valley Bank Loan Agreement Warrant [Member] |
Assumptions Used for Black-Scholes Option Pricing Model | We estimated the fair value of the warrant using the Black-Scholes option pricing model with the following assumptions:
Expected life (years) |  |  | 10 |
Risk-free interest rate |  |  | 1.9 | %
Expected volatility |  |  | 88.1 | %
Expected dividend yield |  |  | 0 | %

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- Definition Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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