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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Dec. 31, 2017
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, Trade name $ 2,302   $ 2,497      
Intangible assets, gross 12,284   13,053      
Accumulated amortization (4,575)   (3,828)      
Intangible assets, net 7,709 $ 8,241 9,225 $ 9,563 $ 10,075 $ 11,021
Customer Relationships [Member]            
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, gross 5,935   6,234      
Developed Technology [Member]            
Finite and Indefinite Lived Intangible Assets [Line Items]            
Intangible assets, gross $ 4,047   $ 4,322