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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified |
Sep. 30, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Sep. 30, 2013
Series A Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series A Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series A Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series B Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series B Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series B Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series B-1 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series B-1 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series B-1 Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series C Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series C Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series C Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series C-1 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series C-1 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series C-1 Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series C-2 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series C-2 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series C-2 Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series C-3 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series C-3 Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series C-3 Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series D Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series D Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series D Redeemable Convertible Preferred Stock [Member]
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Sep. 30, 2013
Series E Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2012
Series E Redeemable Convertible Preferred Stock [Member]
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Dec. 31, 2011
Series E Redeemable Convertible Preferred Stock [Member]
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Redeemable convertible preferred stock, par value | ||||||||||||||||||||||||||||||
| Redeemable convertible preferred stock, stated value | $ 1.21 | $ 1.21 | $ 1.21 | $ 0.72 | $ 0.72 | $ 0.72 | $ 0.83 | $ 0.83 | $ 0.83 | $ 1.10 | $ 1.10 | $ 1.10 | $ 1.57 | $ 1.57 | $ 1.57 | $ 1.88 | $ 1.88 | $ 1.88 | $ 1.88 | $ 1.88 | $ 1.88 | $ 3.38 | $ 3.38 | $ 3.38 | $ 5.25 | $ 5.25 | $ 5.25 | |||
| Liquidation preference | $ 0 | $ 1,406 | $ 1,327 | $ 0 | $ 709 | $ 679 | $ 0 | $ 1,380 | $ 1,320 | $ 0 | $ 7,162 | $ 6,757 | $ 0 | $ 34,222 | $ 32,285 | $ 0 | $ 44,614 | $ 42,089 | $ 0 | $ 29,819 | $ 28,131 | $ 0 | $ 76,347 | $ 72,019 | $ 0 | $ 214,086 | $ 120,621 | |||
| Redeemable convertible preferred stock, authorized | 0 | 705,400 | 705,400 | 0 | 694,000 | 694,000 | 0 | 1,212,360 | 1,212,360 | 0 | 4,546,360 | 4,546,360 | 0 | 15,934,528 | 15,934,528 | 0 | 18,617,020 | 18,617,020 | 0 | 13,297,872 | 13,297,872 | 0 | 19,803,685 | 19,803,685 | 0 | 38,095,239 | 28,571,429 | |||
| Redeemable convertible preferred stock, issued | 0 | 705,400 | 705,400 | 0 | 694,000 | 694,000 | 0 | 1,212,360 | 1,212,360 | 0 | 4,546,360 | 4,546,360 | 0 | 15,934,528 | 15,934,528 | 0 | 18,617,020 | 18,617,020 | 0 | 13,297,872 | 13,297,872 | 0 | 19,803,685 | 19,803,685 | 0 | 38,095,239 | 22,285,716 | |||
| Redeemable convertible preferred stock, outstanding | 0 | 705,400 | 705,400 | 0 | 694,000 | 694,000 | 0 | 1,212,360 | 1,212,360 | 0 | 4,546,360 | 4,546,360 | 0 | 15,934,528 | 15,934,528 | 0 | 18,617,020 | 18,617,020 | 0 | 13,297,872 | 13,297,872 | 0 | 19,803,685 | 19,803,685 | 0 | 38,095,239 | 22,285,716 | |||
| Common stock, par value | ||||||||||||||||||||||||||||||
| Common stock, authorized | 200,000,000 | 160,000,000 | 155,000,000 | |||||||||||||||||||||||||||
| Common stock, issued | 96,987,495 | 5,661,525 | 5,453,893 | |||||||||||||||||||||||||||
| Common stock, outstanding | 96,987,495 | 5,661,525 | 5,453,893 |