Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Stockholders' equity:
Preferred stock - par value	$ 0.0001	$ 0.0001
Preferred stock - authorized shares	10,000,000	10,000,000
Preferred stock - shares issued	0	0
Preferred stock - shares outstanding	0	0
Common stock - par value per share	$ 0.0001	$ 0.0001
Common stock - shares authorized	160,000,000	160,000,000
Common stock - shares issued	78,712,496	78,437,309
Common stock - shares outstanding	78,712,496	78,437,309