CONSOLIDATED BALANCE SHEETS - Unaudited (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Common shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common shares, authorized	70,000,000	70,000,000
Common shares, issued	30,306,245	29,928,490
Common shares, outstanding	30,306,245	29,928,490
Excess shares, par value (in dollars per share)	$ 0.0001	$ 0.0001
Excess shares, authorized	30,000,000	30,000,000
Excess shares, issued	0	0