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Goodwill and Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Acquired Finite-Lived Intangible Assets |  |
Gross Carrying Amount | $ 3,030 | $ 3,030
Accumulated Amortization | (1,957) | (1,491)
Total Net Carrying Amount | 1,073 | 1,539
Developed technology |  |
Acquired Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 2,460 | 2,460
Accumulated Amortization | (1,478) | (1,126)
Total Net Carrying Amount | 982 | 1,334
Customer relationships |  |
Acquired Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 520 | 520
Accumulated Amortization | (437) | (333)
Total Net Carrying Amount | 83 | 187
Domain names |  |
Acquired Finite-Lived Intangible Assets |  |
Gross Carrying Amount | 50 | 50
Accumulated Amortization | (42) | (32)
Total Net Carrying Amount | $ 8 | $ 18

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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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