Subsequent Events - Additional Information (Detail) (Subsequent Event, USD $)		1 Months Ended
Feb. 06, 2013 Mitsui & Co., Ltd	Jan. 24, 2013 Senior Subordinated Notes	Jan. 24, 2013 Senior Subordinated Notes Early Conversion Payment
Subsequent Event [Line Items]
Aggregate principal amount of debt		$ 125,000,000
Debt instrument, fixed interest rate		6.00%
Interest payment, beginning date		Aug. 01, 2013
Maturity date of debt		Feb. 01, 2018
Net proceeds from note offering		119,400,000
Conversion rate of convertible note into shares of common stock		121.1240
Principal amount of convertible notes, denominator		1,000	1,000
Conversion price of per share		$ 8.26
Conversion price of per principal amount			$ 83.33
Percentage of purchase price of notes		100.00%
Research and development	$ 20,000,000

Collaborative agreement contract price.

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- Definition

Conversion Of Stock Conversion Price

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- Definition

Debt Instrument, Convertible, Conversion Ratio Denominator

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Debt Instrument, Convertible, Conversion Ratio Numerator

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- Definition

Debt Instrument, First Interest Payment Date

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- Definition

Percentage Price Of Principal Amount For Repurchase Of Senior Note

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- Definition

The portion of the carrying value of convertible subordinated debt as of the balance sheet date that is scheduled to be repaid after one year or beyond the normal operating cycle if longer. This form of debt can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder, and places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Name Regulation S-X (SX)

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-Section 02

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- Definition

The price per share of the conversion feature embedded in the debt instrument.

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- Definition

Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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-Name Regulation S-X (SX)

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- Definition

The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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