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Intangible Assets - Summary of Gross Carrying Amount and Related Accumulated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets Including Goodwill [Line Items]    
Goodwill, Gross Carrying Amount $ 950 $ 950
Total intangible assets, Gross Carrying Amount 16,831 12,178
Goodwill, Accumulated Amortization (234) (234)
Total intangible assets, Accumulated Amortization (6,224) (5,730)
Net Amount 9,891  
Goodwill, Net Amount 716 716
Total intangible assets, Net Amount 10,607 6,448
Customer List [Member]    
Intangible Assets Including Goodwill [Line Items]    
Gross Carrying Amount 2,485 2,485
Accumulated Amortization (2,440) (2,276)
Net Amount 45 209
Software [Member]    
Intangible Assets Including Goodwill [Line Items]    
Gross Carrying Amount 13,396 8,743
Accumulated Amortization (3,550) (3,220)
Net Amount $ 9,846 $ 5,523