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Consolidated financial statement details | 12 Months Ended
--- | ---
Dec. 31, 2015
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
| December 31,
(in thousands) | 2015 |  | 2014
Components | $ | 9,476 |  |  | $ | 4,324 |
Finished goods | 178,756 |  |  | 148,702 |
Total inventory | $ | 188,232 |  |  | $ | 153,026 |
Prepaid expenses and other current assets
| December 31,
(in thousands) | 2015 |  | 2014
Prepaid expenses | $ | 6,132 |  |  | $ | 3,905 |
Prepaid income taxes | 4,696 |  |  | 26,504 |
Tenant allowance receivable | 4,249 |  |  | — |
Prepaid licenses | 2,818 |  |  | 2,053 |
Current deferred tax assets | — |  |  | 24,218 |
Other current assets | 7,366 |  |  | 7,089 |
Prepaid expenses and other current assets | $ | 25,261 |  |  | $ | 63,769 |
Property and equipment, net
(dollars in thousands) | Useful life (in years) |  | December 31, 2015 |  | December 31, 2014
Leasehold improvements | 3–10 |  | $ | 40,841 |  |  | $ | 22,787 |
Production, engineering and other equipment | 4 |  | 25,174 |  |  | 8,755 |
Tooling | 1–2 |  | 19,537 |  |  | 16,159 |
Computers and software | 2 |  | 14,581 |  |  | 9,731 |
Furniture and office equipment | 3 |  | 11,389 |  |  | 6,150 |
Construction in progress |  |  | 4,632 |  |  | 3,944 |
Tradeshow equipment and other | 2-5 |  | 4,136 |  |  | 3,830 |
Gross property and equipment |  |  | 120,290 |  |  | 71,356 |
Less: Accumulated depreciation and amortization |  |  | (50,240 | ) |  | (29,800) |
Property and equipment, net |  |  | $ | 70,050 |  |  | $ | 41,556 |
Depreciation expense was $24.8 million, $16.8 million and $10.9 million in 2015, 2014 and 2013, respectively. Acquisitions and acquired intangible assets and goodwill In 2015, the Company completed acquisitions qualifying as business combinations for aggregate consideration of $70.2 million, the substantial majority of which was cash consideration. These acquisitions were not material to the Company's consolidated financial statements, either individually or in the aggregate, and therefore actual and proforma disclosures under the applicable accounting guidance have not been presented. The following table summarizes the allocation of the fair values of the assets acquired and liabilities assumed, and the related useful lives, where applicable:
(in thousands) | Estimated useful life (in years) |  | Fair value
Purchased technology | 4 - 6 years |  | $ | 25,676 |
In-process research and development (IPR&D) |  |  | 6,600 |
Net liabilities assumed |  |  | (353 | )
Deferred income tax liabilities |  |  | (4,676 | )
Net assets acquired |  |  | 27,247 |
Goodwill |  |  | 43,000 |
Total fair value consideration |  |  | $ | 70,247 |
Goodwill is primarily attributable to expected synergies in the technologies that can be leveraged by the Company in future product offerings related to device and software offerings. Goodwill is not expected to be deductible for tax purposes. The carrying amount of goodwill was $57.1 million and $14.1 million as of December 31, 2015 and 2014, respectively. The increase in 2015 and 2014 was entirely attributable to goodwill acquired. The following table summarizes the Company's acquired intangible assets:
| December 31, 2015
(in thousands) | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology and other amortizable assets | $ | 32,952 |  |  | $ | (8,540 | ) |  | $ | 24,412 |
IPR&D and other non-amortizable assets | 6,615 |  |  | — |  |  | 6,615 |
Total intangible assets | $ | 39,567 |  |  | $ | (8,540 | ) |  | $ | 31,027 |
| December 31, 2014
(in thousands) | Gross carrying value |  | Accumulated amortization |  | Net carrying value
Purchased technology and other amortizable assets | $ | 7,275 |  |  | $ | (4,353 | ) |  | $ | 2,922 |
Other non-amortizable assets | 15 |  |  | — |  |  | 15 |
Total intangible assets | $ | 7,290 |  |  | $ | (4,353 | ) |  | $ | 2,937 |
As of December 31, 2015, technological feasibility has not been established for IPR&D assets; they have no alternative future use and, as such, continue to be accounted for as indefinite-lived intangible assets. Amortization expense was $4.2 million, $1.1 million and $1.1 million in 2015, 2014 and 2013, respectively. At December 31, 2015, the estimated amortization expense of existing intangible assets for future periods is as follows:
(in thousands) |  | Total
Year ending December 31, |  |
2016 |  | $ | 5,956 |
2017 |  | 5,172 |
2018 |  | 4,780 |
2019 |  | 4,269 |
2020 |  | 3,365 |
Thereafter |  | 870 |
|  | $ | 24,412 |
Other long-term assets
| December 31,
(in thousands) | 2015 |  | 2014
POP displays | $ | 27,989 |  |  | $ | 18,743 |
Long-term deferred tax assets | 41,936 |  |  | 8,611 |
Income tax receivable | 33,206 |  |  | — |
Deposits and other | 8,430 |  |  | 8,706 |
Other long-term assets | $ | 111,561 |  |  | $ | 36,060 |
Accrued liabilities
| December 31,
(in thousands) | 2015 |  | 2014
Accrued payables | $ | 64,831 |  |  | $ | 56,617 |
Excess purchase order commitments | 38,477 |  |  | 447 |
Accrued sales incentive | 29,298 |  |  | 9,635 |
Employee related liabilities | 26,491 |  |  | 28,959 |
Warranty liability | 10,400 |  |  | 6,025 |
Customer deposits | 8,877 |  |  | 4,903 |
Income taxes payable | 7,536 |  |  | 2,732 |
Other | 6,536 |  |  | 9,189 |
Accrued liabilities | $ | 192,446 |  |  | $ | 118,507 |

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