Consolidated Balance Sheets (Parenthetical) (USD $)	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2012
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000	150,000,000
Common stock, shares issued	78,113,639	64,686,919	58,535,411
Common stock, shares outstanding	78,113,639	64,686,919	58,535,411