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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 48,578 | $ 29,575
Accumulated amortization | 22,506 | 12,365
Net book value | 26,072 | 17,210
Software development costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 24,963 | 12,297
Accumulated amortization | 9,226 | 5,394
Net book value | 15,737 | 6,903
Acquired technology and customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 16,051 | 12,935
Accumulated amortization | 8,221 | 3,382
Net book value | 7,830 | 9,553
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 6,973 | 3,752
Accumulated amortization | 4,503 | 3,080
Net book value | 2,470 | 672
Domain names |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 591 | 591
Accumulated amortization | 556 | 509
Net book value | $ 35 | $ 82

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