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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended 9 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2004
Dec. 31, 2011
Jun. 30, 2012
Deutsche Bank Securities
Sep. 30, 2011
Berkeley, California (the "Berkeley Lease")
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, A
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, A
Maximum
Dec. 31, 2004
Berkeley, California (the "Berkeley Lease")
Contingency, B
Sep. 30, 2011
Dusseldorf, Germany (the "Dusseldorf Lease")
Loss Contingencies [Line Items]                        
Operating leases expiration date               2017-09       2023-03
Rent expense, net $ 0.4 $ 0.5 $ 0.8 $ 0.9                
Deferred rent 0.6   0.6     0.6            
Letter of credit pledged as security         0.4   0.2          
Terms of the lease         If the total amount of our cash, cash equivalents and marketable securities falls below $20.0 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 $20.0 million for the remainder of the lease term, or until our actual cash and cash equivalents remains above $20.0 million for a period of 12 consecutive months.              
Cash, cash equivalents and marketable securities 160.2   160.2             20.0 20.0  
Contingency period for cash, cash equivalents and marketable securities                   30 days 12 months  
Increase in amount of the security deposit                 1.1      
Future payments obligation     $ 10.0