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Condensed Consolidated Balance Sheets (Parenthetical) (Common Class A, USD $)
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Jun. 30, 2013
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Dec. 31, 2012
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|---|---|---|
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Common Class A
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| Common stock, par value | $ 0.0001 | $ 0.0001 |
| Common stock, shares authorized | 150,000,000 | 150,000,000 |
| Common stock, shares issued | 30,040,212 | 26,693,696 |
| Common stock, shares outstanding | 30,040,212 | 26,693,696 |