Stockholders' Equity (Details 4)	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Weighted average fair value per warrant	5.03	4.87
Risk-free interest rate	0.99%	1.18%
Expected lives	7 years 6 months	7 years
Expected volatility	36.98%	28.18%

Represents the weighted average fair value of the warrant.

No definition available.

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ 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 (e)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

+ References

+ Details

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- Definition

Risk-free interest rate assumption used in valuing an instrument.

+ References

+ Details

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