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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Loss Contingencies [Line Items]          
Rent expense, net $ 0.5 $ 0.4 $ 0.9 $ 0.8  
Deferred rent 0.6   0.6   0.6
Future payments obligation     $ 5.3    
CALIFORNIA
         
Loss Contingencies [Line Items]          
Operating leases expiration date     2018-06    
Dusseldorf, Germany (the "Dusseldorf Lease")
         
Loss Contingencies [Line Items]          
Operating leases expiration date     2023-03