Facility Lease - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jul. 31, 2011
Leases Disclosure [Line Items]
Rentable square feet of office and laboratory facilities	45,000
Lease term	10 years
Aggregate minimum lease commitment over payment lease term	$ 15.0
Capitalized leasehold improvements	4.5
Maximum
Leases Disclosure [Line Items]
Tenant improvement allowance	2.6
Letter of Credit
Leases Disclosure [Line Items]
Security given to landlord to secure lease obligation	$ 1.1
Extended Term
Leases Disclosure [Line Items]
Lease term	5 years