Consolidated Balance Sheets (Parenthetical) - $ / shares	Jun. 30, 2015	Dec. 31, 2014
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, authorized	500,000,000	500,000,000
Common stock, issued	39,304,758	38,592,808
Common stock, outstanding	39,304,758	38,592,808