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Redeemable Convertible Preferred Stock and Shareholders' Deficit - Summary of Aggregate Redemption of Shares (Detail) (USD $)
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Dec. 31, 2012
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Dec. 31, 2011
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Series E Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 5.62 | $ 5.41 |
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Series D Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 3.86 | $ 3.64 |
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Series C-3 Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 2.24 | $ 2.12 |
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Series C-2 Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 2.40 | $ 2.26 |
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Series C-1 Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 2.15 | $ 2.03 |
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Series C Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 1.58 | $ 1.49 |
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Series B-1 Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 1.14 | $ 1.09 |
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Series B Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 1.02 | $ 0.98 |
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Series A Redeemable Convertible Preferred Stock [Member]
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| Temporary Equity [Line Items] | ||
| Aggregate redemption price per share | $ 1.99 | $ 1.88 |