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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
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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

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- Definition Gross carrying amount of finite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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