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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 07, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Loss Contingencies [Line Items]            
Rent expense, net   $ 0.6 $ 0.5 $ 1.6 $ 1.5  
Deferred rent   $ 0.4   $ 0.4   $ 0.5
Litigation settlement agreement date       September 7, 2016    
Dynavax Technologies Securities Litigation            
Loss Contingencies [Line Items]            
Litigation amount payable $ 4.1          
Dynavax Technologies Securities Litigation | Accrued Liabilities            
Loss Contingencies [Line Items]            
Estimated loss accrual on litigation 4.1          
Dynavax Technologies Securities Litigation | Prepaid Expenses and Other Current Assets            
Loss Contingencies [Line Items]            
Anticipated recovery on litigation $ 4.1          
Berkeley, California (the "Berkeley Lease")            
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