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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Loss Contingencies [Line Items]          
Unoccupied facility expense   $ 131   $ 386  
Rent expense, net $ 500 $ 400 $ 1,500 $ 1,300  
Deferred rent $ 500   500   $ 600
Future payments obligation     $ 7,200    
Berkeley, California (the "Berkeley Lease")          
Loss Contingencies [Line Items]          
Operating leases expiration date     2018-06    
Unoccupied facility expense         $ 400
Dusseldorf, Germany (the "Dusseldorf Lease")          
Loss Contingencies [Line Items]          
Operating leases expiration date     2023-03