CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Stockholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.0010	$ 0.0010
Preferred stock, shares authorized (in shares)	20,000,000	20,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.0013	$ 0.0013
Common stock, shares authorized (in shares)	80,000,000	40,000,000
Common stock, shares issued (in shares)	34,046,409	33,325,802
Common stock, shares outstanding (in shares)	33,846,409	33,125,802
Treasury stock (in shares)	200,000	200,000