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Revenue - Deferred Revenue (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Deferred Revenue Arrangement [Line Items] |  |
Total deferred revenue | $ 108,699 | $ 101,164
Less: current portion | (65,999) | (62,233)
Non-current portion | 42,700 | 38,931
Products |  |
Deferred Revenue Arrangement [Line Items] |  |
Total deferred revenue | 7,358 | 6,593
Services |  |
Deferred Revenue Arrangement [Line Items] |  |
Total deferred revenue | $ 101,341 | $ 94,571

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