Fan Pier Leases (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	6 Months Ended
May 31, 2011	Jun. 30, 2011	Jun. 30, 2011
Fan Pier Leases
Number of leases	2
Area of leased property (in square feet)	1,100,000
Number of buildings under lease agreement	2
Initial term of lease agreement (in years)			15
Project construction costs		$ 9.9	$ 9.9
Optional term of lease agreement (in years)			10
Rent expense related to land operating lease		$ 0.6

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Represents initial period term of lease agreement.

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- Definition

Rental expense incurred for land leased on which buildings are constructed.

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- Definition

Represents the number of leases entered by the reporting entity.

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- Definition

Represents number of buildings under lease agreements.

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- Definition

Represents additional period to extend term of lease agreement.

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- Definition

Represents project construction costs related to the construction project, including the responsibility to pay for a portion of the costs of tenant improvements and structural elements of the buildings, recorded financing obligation in "Property and equipment, net" and "Construction financing obligation" on the condensed consolidated balance sheet.

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- Definition

The amount of area of square footage of office and laboratory space related to the leased property.

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