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Stockholders' Equity (Details) (USD $)
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9 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended | 12 Months Ended | 12 Months Ended | 0 Months Ended | ||||||||||||||||||||
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Sep. 30, 2012
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Dec. 31, 2011
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Sep. 30, 2012
2000 Equity Incentive Plan [Member]
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Dec. 31, 2011
2000 Equity Incentive Plan [Member]
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Sep. 30, 2012
2012 Equity Incentive Plan [Member]
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Dec. 31, 2011
2012 Equity Incentive Plan [Member]
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Sep. 30, 2012
Stock Options [Member]
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Sep. 30, 2011
Stock Options [Member]
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Sep. 30, 2012
Stock Options [Member]
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Sep. 30, 2011
Stock Options [Member]
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Sep. 30, 2012
Pro forma shares issued
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Sep. 30, 2012
Common Stock [Member]
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Sep. 30, 2012
Common Stock [Member]
Stock Options [Member]
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Sep. 30, 2012
Common Stock [Member]
Other equity compensation
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Sep. 30, 2012
Convertible Preferred Stock [Member]
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Dec. 31, 2001
Series A convertible preferred stock [Member]
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Dec. 31, 2000
Series A convertible preferred stock [Member]
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Dec. 31, 2001
Series A convertible preferred stock [Member]
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Jan. 01, 2003
Series A convertible preferred stock [Member]
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Sep. 30, 2012
Series A convertible preferred stock [Member]
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Dec. 31, 2011
Series A convertible preferred stock [Member]
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Dec. 30, 2003
Series B convertible preferred stock [Member]
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Sep. 30, 2012
Series B convertible preferred stock [Member]
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Dec. 31, 2011
Series B convertible preferred stock [Member]
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Dec. 31, 2004
Series C convertible preferred stock [Member]
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Sep. 30, 2012
Series C convertible preferred stock [Member]
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Dec. 31, 2011
Series C convertible preferred stock [Member]
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Oct. 03, 2012
Issuance of Equity [Member]
Subsequent Event [Member]
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Oct. 03, 2012
IPO [Member]
Issuance of Equity [Member]
Subsequent Event [Member]
Common Stock [Member]
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Oct. 03, 2012
IPO [Member]
Issuance of Equity [Member]
Subsequent Event [Member]
Convertible Preferred Stock [Member]
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| Stockholders Equity [Line Items] | ||||||||||||||||||||||||||||||
| Shares issued during period | 724,458 | 574,998 | 1,498,137 | 11,031,387 | 1,729,636 | 7,836,250 | ||||||||||||||||||||||||
| Shares issued during period from share-based compensation | 703,440 | 21,018 | ||||||||||||||||||||||||||||
| Shares repurchase of unvested early-exercised stock options | 0 | (3,334) | (60,125) | (10,001) | (60,125) | |||||||||||||||||||||||||
| Options outstanding under the stock option plans | 6,539,099 | 6,312,041 | 6,539,099 | 6,312,041 | ||||||||||||||||||||||||||
| Options available for future grants under the stock option plans | 832,838 | 803,237 | 3,050,000 | 0 | ||||||||||||||||||||||||||
| Convertible preferred stock outstanding | 17,597,258 | 17,597,258 | 4,766,543 | 4,766,543 | 11,031,387 | 11,031,387 | 1,799,328 | 1,799,328 | ||||||||||||||||||||||
| Total shares reserved for future issuance | 28,019,195 | 24,712,536 | ||||||||||||||||||||||||||||
| Conversion of stock, shares converted | 17,597,258 | |||||||||||||||||||||||||||||
| Shares outstanding on fully diluted basis | 37,937,228 | |||||||||||||||||||||||||||||
| Preferred stock, shares authorized | 176,400,000 | 48,079,860 | 48,079,860 | 110,314,114 | 110,314,114 | 18,006,026 | 18,006,026 | 20,000,000 | ||||||||||||||||||||||
| Preferred stock, par value per share (in dollars per share) | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | $ 0.001 | ||||||||||||||||||||||
| Price per share of issued stock (in dollars per share) | $ 14.00 | $ 14.00 | $ 14.00 | $ 6.00 | $ 2.60 | $ 3.76 | ||||||||||||||||||||||||
| Shares of common stock issued upon conversion of preferred stock | 1 | 1 | ||||||||||||||||||||||||||||
| Minimum price per share in public offering to trigger preferred stock conversion (in dollars per share) | $ 12 | |||||||||||||||||||||||||||||
| Aggregate offering proceeds from public offering to trigger preferred stock conversion | $ 20,000,000 | |||||||||||||||||||||||||||||