Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Consolidated Balance Sheets
Series A preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Series A preferred stock, shares authorized	65,000,000	65,000,000
Series A preferred stock, shares issued	0	0
Series A preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	130,000,000	130,000,000
Common stock, shares issued	30,894,666	30,621,869
Common stock, shares outstanding	30,894,666	30,621,869