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Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Mar. 31, 2014 Berkeley, California (the "Berkeley Lease")	Sep. 30, 2013 Berkeley, California (the "Berkeley Lease")	Mar. 31, 2014 Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]
Operating leases expiration date				2018-06		2023-03
Unoccupied facility expense	$ 77,000			$ 100,000	$ 900,000
Rent expense, net	400,000	400,000
Deferred rent	600,000		600,000
Future payments obligation	$ 38,400,000

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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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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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

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