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Consolidated Balance Sheets (Parenthetical) (USD $)
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2011
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|---|---|---|---|
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Class A Common Stock [Member]
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| Par value | $ 0.0003 | $ 0.0003 | $ 0.0003 |
| Shares authorized | 200,000,000 | 200,000,000 | 100,000,000 |
| Shares issued | 83,045,895 | 80,992,252 | 38,480,071 |
| Shares outstanding | 83,045,895 | 80,992,252 | 38,480,071 |
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Class B Convertible Common Stock [Member]
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| Par value | $ 0.0003 | $ 0.0003 | $ 0.0003 |
| Shares authorized | 21,600,000 | 22,500,000 | 12,500,000 |
| Shares issued | 21,600,000 | 22,500,000 | 12,500,000 |
| Shares outstanding | 21,600,000 | 22,500,000 | 12,500,000 |