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Description of the Business and Significant Accounting Policies (Details) (USD $)
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1 Months Ended |
9 Months Ended |
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Aug. 31, 2012
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Jul. 31, 2012
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Apr. 30, 2012
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Oct. 31, 2012
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Jul. 25, 2012
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Apr. 24, 2012
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| Initial Public Offering |
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| Number of shares sold to public |
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15,525,000 |
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| Shares of common stock issued pursuant to the full exercise of overallotment option granted to the underwriters |
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2,025,000 |
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| Common stock sold by selling stockholders (in shares) |
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992,722 |
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| Aggregate net proceeds received |
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$ 225,225,000 |
$ 225,225,000 |
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| Number of shares of common stock issued upon conversion of convertible preferred stock |
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56,930,194 |
| Number of shares of common stock issuable against warrants |
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469,557 |
| Shares offered by the stockholders to the public |
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11,744,064 |
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| Share price of shares offered by the stockholders to the public (in dollars per share) |
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$ 28.25 |
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| Aggregate offering price for shares sold in the offering, net of underwriting discounts and commissions |
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$ 320,200,000 |
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| Shares issued pursuant to exercise of underwriters option to purchase additional shares |
1,761,609 |
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