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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Loss Contingencies [Line Items]
Rent expense, net	$ 0.4	$ 0.4	$ 1.3	$ 1.3
Deferred rent	0.6		0.6		0.6
Future payments obligation			$ 10.5
Berkeley, California (the "Berkeley Lease")
Loss Contingencies [Line Items]
Operating leases expiration date			2017-09
Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]
Operating leases expiration date			2023-03

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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