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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Loss Contingencies [Line Items]            
Unoccupied facility expense   $ 178   $ 255    
Rent expense, net $ 500 $ 400 $ 1,000 $ 900    
Deferred rent $ 500   500   $ 600  
Future payments obligation     $ 12,300      
Berkeley, California (the "Berkeley Lease")            
Loss Contingencies [Line Items]            
Operating leases expiration date     2018-06      
Unoccupied facility expense         $ 400 $ 900
Dusseldorf, Germany (the "Dusseldorf Lease")            
Loss Contingencies [Line Items]            
Operating leases expiration date     2023-03