CONSOLIDATED BALANCE SHEETS (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Stockholders' equity:
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, authorized	20,000,000	20,000,000
Preferred stock, issued	0	0
Preferred stock, outstanding	0	0
Common stock, par value	$ 0.0013	$ 0.0013
Common stock, authorized	80,000,000	80,000,000
Common stock, issued	46,765,472	34,046,409
Common stock, shares outstanding (in shares)	46,565,472	33,846,409
Treasury stock, shares	200,000	200,000