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Gross Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 58,583 | $ 84,678
Accumulated Amortization | (31,518) | (54,591)
Net Carrying Amount | 27,065 | 30,087
Customer Relationships |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,800 | 28,000
Accumulated Amortization | (621) | (26,757)
Net Carrying Amount | 1,179 | 1,243
Developed Technology |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 55,772 | 55,772
Accumulated Amortization | (30,548) | (27,515)
Net Carrying Amount | 25,224 | 28,257
Internal Use Software |  |
Acquired Finite Lived Intangible Assets [Line Items] |  |
Gross Carrying Amount | 1,011 | 906
Accumulated Amortization | (349) | (319)
Net Carrying Amount | $ 662 | $ 587

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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/disclosureRef -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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