Annual report pursuant to Section 13 and 15(d)

Consolidated Statements of Stockholders' Equity (Parenthetical)

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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]    
Common stock, par value (usd per share) $ 0.001 $ 0.001