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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Goodwill And Intangible Assets [Line Items]      
Goodwill $ 26,109   $ 23,857
Amortization expense of intangible assets 1,300 $ 1,100  
Cost of Testing Services      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 300 300  
Cost of Product      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 500 400  
Cost of Digital and Other      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets 100 100  
Sales and Marketing Expense      
Goodwill And Intangible Assets [Line Items]      
Amortization expense of intangible assets $ 400 $ 300