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CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)
Jun. 30, 2011
Dec. 31, 2010
Stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stocked, authorized (in shares) 10,000,000 10,000,000
Preferred stocked, issued (in shares) 0 0
Preferred stocked,outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized (in shares) 40,000,000 40,000,000
Common stock, Issued (in shares) 17,742,538 17,705,980
Common stock, outstanding (in shares) 17,599,421 17,562,901