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Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 26, 2018
Mar. 15, 2017
Dec. 31, 2018
Dec. 31, 2017
Loss Contingencies [Line Items]        
Rental expense under operating leases     $ 2,100 $ 2,700
Payment of tariffs to be made from unfavorable ruling     3,700  
Amount award to other party $ 1,000      
Stock issued during period, litigation settlement (in shares) 500,000      
Additional amount awarded to other party, within 12 months $ 1,000      
Additional amount awarded to other party, within 24 months $ 1,000      
Extinguishment of acquisition-related liabilities     17,174 $ 0
Contingent consideration, liability, current     1,000  
Contingent consideration, liability, noncurrent     $ 1,000  
Former stockholders of RER        
Loss Contingencies [Line Items]        
Stock issued during period, shares, acquisitions (in shares)   973,333