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Commitments and Contingencies - Additional Information (Detail) - USD ($)
 1 Months Ended 12 Months Ended
May 31, 2016
Sep. 30, 2014
Dec. 31, 2012
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Loss Contingencies [Line Items]            
Amount provided lessor with irrevocable letter of credit       $ 100,000    
Rent expense under operating leases       $ 1,300,000 $ 900,000 $ 600,000
December 2012, Amended Facility Lease Agreement [Member]            
Loss Contingencies [Line Items]            
Lease expiration date     Sep. 30, 2016      
September 2014, Amended Facility Lease Agreement [Member]            
Loss Contingencies [Line Items]            
Lease expiration date   Sep. 30, 2019        
Lease improvement allowance maximum amount   $ 600,000        
May 2016, Amended Facility Lease Agreement [Member]            
Loss Contingencies [Line Items]            
Lease expiration date Sep. 30, 2021          
Lease improvement allowance maximum amount $ 400,000