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Summary of Significant Accounting Policies - Schedule of fair value on a recurring basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Inputs, Level 1 [Member]    
Assets:    
Money market funds $ 16,775 $ 481
Mutual funds 14,264 0
Fair Value, Inputs, Level 2 [Member]    
Assets:    
Short-term investments 74,510 0
Company-owned life insurance 0 10,464
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Contingent consideration $ 2,696 $ 20,039