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Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Finite-Lived Intangible Assets [Line Items] |  |
Cost | $ 208,922 | $ 208,660
Accumulated amortization | 73,246 | 41,378
Net book value | 135,676 | 167,282
Acquired technology |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 161,643 | 161,643
Accumulated amortization | 36,953 | 17,332
Net book value | 124,690 | 144,311
Software development costs |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 27,520 | 27,489
Accumulated amortization | 25,720 | 16,690
Net book value | 1,800 | 10,799
Acquired customer relationships |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 8,435 | 8,435
Accumulated amortization | 2,677 | 1,016
Net book value | 5,758 | 7,419
Purchased software |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 6,973 | 6,973
Accumulated amortization | 6,773 | 5,639
Net book value | 200 | 1,334
Other intangible assets |  |
Finite-Lived Intangible Assets [Line Items] |  |
Cost | 4,351 | 4,120
Accumulated amortization | 1,123 | 701
Net book value | $ 3,228 | $ 3,419

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