Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred shares, par value per share (in dollars per share)	$ 0.001	$ 0.001
Preferred shares, shares authorized (in shares)	50,000,000	50,000,000
Preferred shares, shares issued (in shares)	0	0
Preferred shares, shares outstanding (in shares)	0	0
Common shares, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common shares, authorized (in shares)	400,000,000	400,000,000
Common shares, issued (in shares)	17,052,980	16,943,098
Common shares, outstanding (in shares)	17,052,980	16,943,098