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Condensed consolidated financial statement details | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Consolidated financial statement details | Consolidated financial statement details The following sections and tables provide details of selected balance sheet items. 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 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 |
(1) Refer to Note 11 Restructuring charges, for details of operating lease right-of-use asset impairment charges recorded in 2020. Depreciation expense was $14.5 million, $18.5 million and $23.6 million in 2020, 2019 and 2018, respectively. In 2020, the Company recorded accelerated depreciation charges in connection with its plans to vacate certain leased office facilities as disclosed in Note 11 Restructuring charges. 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
Amortization expense was $4.6 million, $7.8 million and $11.4 million in 2020, 2019 and 2018, respectively. 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 |
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 |
Amortization expense for POP displays was $4.2 million, $7.5 million and $13.5 million in 2020, 2019 and 2018, respectively. 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 |
(1) See Note 11 Restructuring charges for amounts associated with restructuring liabilities. Product warranty
|  |  | Year ended December 31,
(in thousands) |  |  |  |  | 2020 |  | 2019 |  | 2018
Beginning balance |  |  |  |  | $ | 11,398 |  |  | $ | 10,971 |  |  | $ | 10,373 |
Charged to cost of revenue |  |  |  |  | 12,690 |  |  | 16,933 |  |  | 24,725 |
Settlement of warranty claims |  |  |  |  | (15,565) |  |  | (16,506) |  |  | (24,127) |
Warranty liability |  |  |  |  | $ | 8,523 |  |  | $ | 11,398 |  |  | $ | 10,971 |
At December 31, 2020 and 2019, $8.0 million and $9.9 million, respectively, of the warranty liability was recorded as a component of accrued expenses and other current liabilities, and $0.5 million and $1.5 million, respectively, was recorded as a component of other long-term liabilities.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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