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Acquisition - Summary of Preliminary Purchase Price for Crosspointe and Preliminary Allocation of Purchase Price (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
Acquired Finite-Lived Intangible Assets [Line Items]  
Cash paid $ 14,930
Fair value of contingent consideration to be settled in stock 1,751
Total purchase price consideration 16,681
Assets acquired and liabilities assumed:  
Commission receivable (current and long-term) 3,460
Operating lease right-of-use assets 1,469
Goodwill 9,794
Total assets acquired 18,593
Accounts payable and accrued expenses (current and long-term) (443)
Operating lease liabilities (1,469)
Total allocation of purchase price consideration 16,681
Customer relationships [Member]  
Assets acquired and liabilities assumed:  
Business Combination, Intangible Assets Acquired 3,600
Other identifiable intangible assets [Member]  
Assets acquired and liabilities assumed:  
Business Combination, Intangible Assets Acquired $ 270