Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Detail)

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Goodwill and Other Intangible Assets - Summary of Goodwill and Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]        
Goodwill, gross carrying amount $ 11,459 $ 11,459    
Intangible assets, gross carrying amount 4,240 4,240    
Goodwill and intangible assets, gross carrying amount, total 15,699 15,699    
Goodwill, accumulated amortization 0 0    
Intangible assets, accumulated amortization (1,052) (314)    
Goodwill, net book value 11,459 11,459 $ 4,186 $ 0
Intangible assets, net book value 3,188 3,926    
Goodwill and intangible assets, net book value $ 14,647 $ 15,385