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Financial Statement Details | 12 Months Ended
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Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Short-term investments At December 31, 2015, the Company had certain short-term investments in trading securities which were acquired through its acquisition of Ctrack. The Company recognized a $70,000 gain on such securities during the year ended December 31, 2015, which is included in other income (expense), net, in the consolidated statements of operations. The Company did not have any gains or losses on trading securities during the year ended December 31, 2014. Inventories Inventories consist of the following (in thousands):
| December 31,
| 2015 |  | 2014
Finished goods | $ | 47,094 |  |  | $ | 33,045 |
Raw materials and components | 8,743 |  |  | 4,758 |
| $ | 55,837 |  |  | $ | 37,803 |
Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2015 |  | 2014
Land | $ | 229 |  |  | $ | — |
Buildings | 2,084 |  |  | — |
Test equipment | 47,243 |  |  | 53,019 |
Computer equipment and purchased software | 11,399 |  |  | 11,247 |
Product tooling | 3,832 |  |  | 3,535 |
Furniture and fixtures | 2,151 |  |  | 1,824 |
Vehicles | 1,042 |  |  | — |
Leasehold improvements | 3,664 |  |  | 4,103 |
| 71,644 |  |  | 73,728 |
Less—accumulated depreciation and amortization | (62,832 | ) |  | (68,449 | )
| $ | 8,812 |  |  | $ | 5,279 |
At December 31, 2015, the Company had vehicles and equipment under capital leases of $1.5 million, net of accumulated amortization of $0.2 million. The Company did not have any capital leases at December 31, 2014. Depreciation and amortization expense relating to property, plant and equipment, including equipment under capital leases, was $5.0 million, $6.3 million and $7.9 million for the years ended December 31, 2015, 2014 and 2013, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2015 |  | 2014
Royalties | $ | 2,740 |  |  | $ | 4,035 |
Payroll and related expenses | 4,406 |  |  | 8,038 |
Warranty obligations | 932 |  |  | 1,196 |
Market development funds and price protection | 2,805 |  |  | 2,502 |
Professional fees | 1,060 |  |  | 780 |
Deferred revenue | 1,836 |  |  | 962 |
Restructuring | 1,044 |  |  | 1,886 |
Acquisition-related earn out and other | 5,274 |  |  | — |
Other | 5,516 |  |  | 4,445 |
| $ | 25,613 |  |  | $ | 23,844 |
Accrued Warranty Obligations Accrued warranty obligations consist of the following (in thousands):
| Year Ended December 31,
| 2015 |  | 2014
Warranty liability at beginning of period | $ | 1,196 |  |  | $ | 2,244 |
Additions charged to operations | 1,090 |  |  | 1,345 |
Deductions from liability | (1,354 | ) |  | (2,393 | )
Warranty liability at end of period | $ | 932 |  |  | $ | 1,196 |

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