Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Statement of Financial Position [Abstract]
Preferred stock, par value (USD per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (shares)	10,000,000	10,000,000
Preferred stock issued (shares)	0	0
Preferred stock shares outstanding (shares)	0	0
Common stock, par value (USD per share)	$ 0.001	$ 0.001
Common stock shares authorized (shares)	150,000,000	150,000,000
Common stock, issued (shares)	50,414,481	44,330,006
Common stock, outstanding (shares)	50,414,481	44,330,006