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Stock-Based Compensation Expense (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Share Based Compensation	$ 2,845	$ 1,903	$ 10,847	$ 6,294
Research and Development Expense
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Share Based Compensation	1,001	824	3,351	2,565
General and Administrative Expense
Deferred Compensation Arrangement With Individual Share Based Payments [Line Items]
Share Based Compensation	$ 1,844	$ 1,079	$ 7,496	$ 3,729

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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