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Consolidated financial statement details | 9 Months Ended
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Sep. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Consolidated financial statement details | Condensed consolidated financial statement details The following sections and tables provide details of selected balance sheet items. Inventory
(in thousands) | September 30, 2016 |  | December 31, 2015
Components | $ | 35,097 |  |  | $ | 9,476 |
Finished goods | 110,134 |  |  | 178,756 |
Total inventory | $ | 145,231 |  |  | $ | 188,232 |
Property and equipment, net
(in thousands) | September 30, 2016 |  | December 31, 2015
Leasehold improvements | $ | 48,019 |  |  | $ | 40,841 |
Production, engineering and other equipment | 40,991 |  |  | 25,174 |
Tooling | 22,592 |  |  | 19,537 |
Computers and software | 17,771 |  |  | 14,581 |
Furniture and office equipment | 12,540 |  |  | 11,389 |
Construction in progress | 2,317 |  |  | 4,632 |
Tradeshow equipment and other | 7,409 |  |  | 4,136 |
Gross property and equipment | 151,639 |  |  | 120,290 |
Less: Accumulated depreciation and amortization | (74,062 | ) |  | (50,240 | )
Property and equipment, net | $ | 77,577 |  |  | $ | 70,050 |
The Company has committed to plans to vacate and sublet certain leased office facilities. Changes in estimated useful life of associated leasehold improvements and office equipment are expected to result in accelerated depreciation expense of approximately $10 million, including $4.3 million recorded for the three months ended September 30, 2016 and $5.4 million ratably over an estimated remaining period of 11 months. Intangible assets and goodwill
| September 30, 2016
(in thousands) | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology | $ | 48,634 |  |  | $ | (15,063 | ) |  | $ | 33,571 |
In-process research and development (IPR&D) | 3,925 |  |  | — |  |  | 3,925 |
Total intangible assets | $ | 52,559 |  |  | $ | (15,063 | ) |  | $ | 37,496 |
| December 31, 2015
(in thousands) | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology | $ | 32,952 |  |  | $ | (8,540 | ) |  | $ | 24,412 |
IPR&D | 6,615 |  |  | — |  |  | 6,615 |
Total intangible assets | $ | 39,567 |  |  | $ | (8,540 | ) |  | $ | 31,027 |
A summary of the Company’s IPR&D activity for the nine months ended September 30, 2016 is as follows:
(in thousands) | Total
Balance at December 31, 2015 | $ | 6,615 |
IPR&D assets acquired | 3,760 |
Technological feasibility achieved | (450 | )
Asset impairment | (6,000 | )
Balance at September 30, 2016 | $ | 3,925 |
Purchased technology acquired in 2016 has an estimated useful life of four years. During the three months ended September 30, 2016, the Company recorded an impairment charge of $6.0 million to research and development expense for IPR&D assets acquired in 2015 that were abandoned in the third quarter of 2016. As of September 30, 2016, technological feasibility has not been established for the remaining IPR&D assets, which have no alternative future use and, as such, continue to be accounted for as indefinite-lived intangible assets. Amortization expense was $6.5 million and $2.7 million in the nine months ended September 30, 2016 and 2015, respectively. At September 30, 2016, the expected amortization expense of amortizable intangible assets for future periods is as follows:
(in thousands) | Total
Year ending December 31, |
2016 (remaining 3 months) | $ | 2,567 |
2017 | 9,506 |
2018 | 8,569 |
2019 | 7,786 |
2020 | 4,273 |
Thereafter | 870 |
| $ | 33,571 |
The carrying amount of goodwill was $146.5 million and $57.1 million as of September 30, 2016 and December 31, 2015, respectively. The increase in 2016 was entirely attributable to the acquisitions described above in Note 2. Accrued liabilities
(in thousands) | September 30, 2016 |  | December 31, 2015
Accrued payables | $ | 73,084 |  |  | $ | 60,738 |
Inventory received not billed | 29,479 |  |  | 4,093 |
Employee related liabilities | 33,935 |  |  | 26,491 |
Accrued sales incentives | 19,637 |  |  | 29,298 |
Warranty liability | 8,858 |  |  | 10,400 |
Customer deposits | 6,520 |  |  | 8,877 |
Income taxes payable | 1,979 |  |  | 7,536 |
Purchase order commitments | 2,374 |  |  | 38,477 |
Other | 8,039 |  |  | 6,536 |
Accrued liabilities | $ | 183,905 |  |  | $ | 192,446 |

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