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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2014
Equity [Abstract] |
Stock Options Valuation Assumptions | The assumptions used in the Black-Scholes model were as follows for stock options granted during the three-month periods ended:
|  | March 31, 2014 |  | March 31, 2013
Risk-free interest rate |  | 2.11 - 2.66% |  | .41 - .63%
Expected volatility of common stock |  | 63.54 - 65.03% |  | 64.04 - 68.26%
Dividend yield |  | 0% |  | 0%
Expected life of options |  | 6.1 - 8.2 years |  | 3.0 - 4.1 years

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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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