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Condensed consolidated financial statement details (Tables) | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Inventory | Inventory
(in thousands) | December 31, 2020 |  | December 31, 2019
Components | $ | 13,229 |  |  | $ | 20,370 |
Finished goods | 84,685 |  |  | 123,866 |
Total inventory | $ | 97,914 |  |  | $ | 144,236 |
Property, Plant and Equipment | Property and equipment, net
(in thousands) | Useful life (in years) |  | December 31, 2020 |  | December 31, 2019
Leasehold improvements (1) | 1–9 |  | $ | 35,180 |  |  | $ | 50,736 |
Production, engineering and other equipment | 4 |  | 48,908 |  |  | 45,649 |
Tooling | 1–2 |  | 17,635 |  |  | 19,216 |
Computers and software | 2 |  | 22,385 |  |  | 21,719 |
Furniture and office equipment | 3 |  | 6,315 |  |  | 10,846 |
Tradeshow equipment and other | 2–5 |  | 5,860 |  |  | 7,009 |
Construction in progress |  |  | 22 |  |  | 45 |
Gross property and equipment |  |  | 136,305 |  |  | 155,220 |
Less: Accumulated depreciation and amortization |  |  | (112,594) |  |  | (118,681) |
Property and equipment, net |  |  | $ | 23,711 |  |  | $ | 36,539 |
Schedule of Finite-Lived Intangible Assets | Intangible assets
| Useful life (in months) |  | December 31, 2020
(in thousands) |  |  | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology | 20-72 |  | $ | 51,066 |  |  | $ | (49,867) |  |  | $ | 1,199 |
Domain name |  |  | 15 |  |  | — |  |  | 15 |
Total intangible assets |  |  | $ | 51,081 |  |  | $ | (49,867) |  |  | $ | 1,214 |
| Useful life (in months) |  | December 31, 2019
(in thousands) |  |  | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology | 20-72 |  | $ | 50,501 |  |  | $ | (45,269) |  |  | $ | 5,232 |
Domain name |  |  | 15 |  |  | — |  | 15 |
Total intangible assets |  |  | $ | 50,516 |  | $ | (45,269) |  |  | $ | 5,247
Schedule of Future Amortization | At December 31, 2020, expected amortization expense of intangible assets with definite lives for future periods was as follows:
(in thousands) | Total
Year ending December 31, |
2021 | $ | 1,152 |
2022 | 47 |
| $ | 1,199 |
Schedule of Other Assets | Other long-term assets
(in thousands) | December 31, 2020 |  | December 31, 2019
Point of purchase (POP) displays | $ | 3,612 |  |  | $ | 7,595 |
Long-term deferred tax assets | 966 |  |  | 864 |
Deposits and other | 7,193 |  |  | 7,002 |
Other long-term assets | $ | 11,771 |  |  | $ | 15,461 |
Schedule of Accrued Liabilities | Accrued expenses and other current liabilities
(in thousands) | December 31, 2020 |  | December 31, 2019
Accrued liabilities (1) | $ | 39,444 |  |  | $ | 42,153 |
Accrued sales incentives | 30,609 |  |  | 39,120 |
Employee related liabilities (1) | 7,067 |  |  | 20,494 |
Return liability | 10,817 |  |  | 14,854 |
Warranty liability | 7,997 |  |  | 9,899 |
Inventory received | 1,709 |  |  | 5,737 |
Customer deposits | 2,347 |  |  | 2,063 |
Purchase order commitments | 1,921 |  |  | 1,710 |
Income taxes payable | 221 |  |  | 1,166 |
Other | 11,644 |  |  | 4,594 |
Accrued expenses and other current liabilities | $ | 113,776 |  |  | $ | 141,790 |

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