Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statement of Changes in Stockholders' Equity (parenthetical)

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Consolidated Statement of Changes in Stockholders' Equity (parenthetical) (USD $)
6 Months Ended
Jun. 30, 2012
Statement of Stockholders' Equity [Abstract]  
Stock-based compensation excess tax benefits $ 1,651,513