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Commitments and Contingencies - Additional Information (Detail) | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended |  | 3 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Dec. 31, 2010 USD ($) | Dec. 31, 2012 Deutsche Bank Securities EUR (€) | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") USD ($) | Dec. 31, 2012 Berkeley, California (the "Berkeley Lease") | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") Contingency, A USD ($) | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") Contingency, A Maximum USD ($) | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") Contingency, A Minimum | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") Contingency, B | Dec. 31, 2004 Berkeley, California (the "Berkeley Lease") Contingency, B Minimum USD ($) | Dec. 31, 2012 Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Operating leases expiration date |  |  |  |  |  | 2018-06 |  |  |  |  |  | 2023-03
Rent expense, net | $ 1,700,000 | $ 1,700,000 | $ 2,600,000 |  |  |  |  |  |  |  |  |
Deferred rent | 600,000 | 600,000 |  |  |  |  |  |  |  |  |  |
Future minimum payment excluding sub lease agreement payment | 41,000 |  |  |  |  |  |  |  |  |  |  |
Letter of credit pledged as security |  |  |  | 200,000 | 400,000 |  |  |  |  |  |  |
Terms of the lease |  |  |  |  | If the total amount of our cash, cash equivalents and marketable securities falls below $20 million for a period of more than 30 consecutive days during the lease term, the amount of the required security deposit will increase to $1.1 million, until such time as our projected cash and cash equivalents will exceed $20 million for the remainder of the lease term, or until our actual cash and cash equivalents remains above $20 million for a period of 12 consecutive months. |  |  |  |  |  |  |
Cash, cash equivalents and marketable securities | 125,100,000 |  |  |  |  |  |  | 20,000,000 |  |  | 20,000,000 |
Contingency period for cash, cash equivalents and marketable securities |  |  |  |  |  |  |  |  | 30 days | 12 months |  |
Increase in amount of the security deposit |  |  |  |  |  |  | 1,100,000 |  |  |  |  |
Future payments obligation | $ 9,900,000 |  |  |  |  |  |  |  |  |  |  |

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