Consolidated Balance Sheets Parenthetical (USD $)	Jun. 30, 2012	Dec. 31, 2011
Stockholders' Equity:
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 stock, par value per share (in dollars per share)	$ 0.001
Common Class A [Member]
Stockholders' Equity:
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	50,000,000	50,000,000
Common stock, shares issued (in shares)	0	2,603,292
Common stock, shares outstanding (in shares)	0	2,603,292
Common Class B [Member]
Stockholders' Equity:
Common stock, par value per share (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	350,000,000	350,000,000
Common stock, shares issued (in shares)	12,024,821	8,834,563
Common stock, shares outstanding (in shares)	12,024,821	8,834,563