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Intangible Assets - Summary of Gross Carrying Amount and Related Accumulated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets Including Goodwill [Line Items]    
Goodwill, Gross Carrying Amount $ 950 $ 950
Total intangible assets, Gross Carrying Amount 12,178 7,639
Goodwill, Accumulated Amortization (234) (234)
Total intangible assets, Accumulated Amortization (5,730) (4,616)
Net Amount 5,732  
Goodwill, Net Amount 716 716
Total intangible assets, Net Amount 6,448 3,023
Customer List [Member]    
Intangible Assets Including Goodwill [Line Items]    
Gross Carrying Amount 2,485 2,516
Accumulated Amortization (2,276) (2,044)
Net Amount 209 472
Software [Member]    
Intangible Assets Including Goodwill [Line Items]    
Gross Carrying Amount 8,743 4,173
Accumulated Amortization (3,220) (2,338)
Net Amount $ 5,523 $ 1,835