Significant weighted average assumptions used in calculating fair value (Details) (USD $)	3 Months Ended
Mar. 31, 2013
Significant weighted average assumptions used in calculating fair value:
Weighted average grant date fair value per share of options granted	$ 10
Expected term	6.32 years
Expected annual volatility	60.00%
Expected annual dividend yield	0.00%
Risk-free interest rate	1.00%

Expected annual dividend yield assumption used in valuing an instrument.

No definition available.

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- Definition

Expected term assumption used in valuing an instrument.

+ References

No definition available.

+ Details

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- Details

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- Definition

Weighted average grant date fair value per share of options granted

+ References

No definition available.

+ 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

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=25499696&loc=d3e19207-110258

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- Definition

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

+ References

+ Details

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