Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Liabilities and Equity
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	656,020,000	656,020,000
Common stock, shares issued (in shares)	37,317,622	36,442,994
Common stock, shares outstanding (in shares)	37,317,622	36,442,994