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Summary of business and significant accounting policies (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Nov. 24, 2020 | Jan. 01, 2018 | Apr. 12, 2017
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Restricted Cash | $ 2,000 | $ 0 |  |  |  |
Allowance for Doubtful Other Receivables, Current | 500 | 800 |  |  |  |
Operating Lease, Impairment Loss | 12,460 | 0 | $ 0 |  |  |
Deferred Revenue | 29,300 | 16,600 |  |  |  |
Deferred Revenue, Revenue Recognized | 15,400 | 15,000 |  |  |  |
Advertising Expense | 34,100 | 67,300 | $ 73,000 |  |  |
Accumulated deficit | $ (650,516) | $ (583,733) |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |  |
Warranty Period | 12 months |  |  |  |  |
Minimum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Long-term Assets, Amortization Period | 24 months |  |  |  |  |
Maximum [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Long-term Assets, Amortization Period | 36 months |  |  |  |  |
Property, Plant and Equipment, Useful Life | 9 years |  |  |  |  |
Cumulative effect of adoption of new accounting standard [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Accumulated deficit |  |  |  |  | $ 15,000 |
Accounting Standards Update 2014-09 [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Accrued Liabilities |  |  |  |  | 4,900 |
Deferred Revenue |  |  |  |  | 2,000 |
Accumulated deficit |  |  |  |  | $ 2,900 |
Convertible Senior Notes due 2022 [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Interest rate |  |  |  |  |  | 3.50%
Debt Instrument |  |  |  |  |  | $ 175,000
Convertible Senior Notes due 2025 [Member] |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |
Interest rate |  |  |  | 1.25% |  |
Debt Instrument |  |  |  | $ 143,800 |  |
Europe [Member] |  |  |  |  |  |
Product Warranty Liability [Line Items] |  |  |  |  |  |
Warranty Period | 2 years |  |  |  |  |

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