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Financial Statement Details | 12 Months Ended
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Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Short-term investments The Company acquired certain short-term investments in trading securities through its acquisition of Ctrack. The Company recognized a gain of approximately $0.2 million and $0.1 million on such securities during the years ended December 31, 2016 and 2015, respectively, which is included in other income (expense), net, in the consolidated statements of operations. Inventories Inventories consist of the following (in thousands):
| December 31,
| 2016 |  | 2015
Finished goods | $ | 19,277 |  |  | $ | 47,094 |
Raw materials and components | 11,865 |  |  | 8,743 |
| $ | 31,142 |  |  | $ | 55,837 |
Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2016 |  | 2015
Land | $ | 260 |  |  | $ | 229 |
Buildings | 2,363 |  |  | 2,084 |
Test equipment | 23,115 |  |  | 47,243 |
Computer equipment and purchased software | 4,373 |  |  | 11,399 |
Product tooling | 409 |  |  | 3,832 |
Furniture and fixtures | 915 |  |  | 2,151 |
Vehicles | 1,746 |  |  | 1,042 |
Leasehold improvements | 243 |  |  | 3,664 |
| 33,424 |  |  | 71,644 |
Less—accumulated depreciation and amortization | (25,032 | ) |  | (62,832 | )
| $ | 8,392 |  |  | $ | 8,812 |
At December 31, 2016, the Company had vehicles and equipment under capital leases of $1.8 million, net of accumulated amortization of $1.1 million. 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. Rental Assets Rental assets consist of the following (in thousands):
| December 31,
| 2016 |  | 2015
Rental assets | $ | 11,115 |  |  | $ | 7,189 |
Less—accumulated depreciation | (4,112 | ) |  | (1,034 | )
| $ | 7,003 |  |  | $ | 6,155 |
Depreciation and amortization expense related to property, plant and equipment, including equipment under capital leases, and rental assets was $7.8 million, $5.0 million and $6.3 million for the years ended December 31, 2016, 2015 and 2014, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2016 |  | 2015
Royalties | $ | 1,544 |  |  | $ | 2,740 |
Payroll and related expenses | 5,315 |  |  | 4,406 |
Warranty obligations | 480 |  |  | 932 |
Market development funds and price protection | 320 |  |  | 2,805 |
Professional fees | 4,793 |  |  | 1,060 |
Deferred revenue | 1,656 |  |  | 1,836 |
Restructuring | 837 |  |  | 1,044 |
Acquisition-related liabilities | 7,912 |  |  | 5,274 |
Divestiture-related liabilities | 463 |  |  | — |
Other | 4,577 |  |  | 5,516 |
| $ | 27,897 |  |  | $ | 25,613 |
Accrued Warranty Obligations Accrued warranty obligations consist of the following (in thousands):
| Year Ended December 31,
| 2016 |  | 2015
Accrued warranty obligations at beginning of period | $ | 932 |  |  | $ | 1,196 |
Additions charged to operations | 821 |  |  | 1,090 |
Deductions from liability | (1,262 | ) |  | (1,354 | )
Effect of change in foreign currency exchange rates | (11 | ) |  | — |
Accrued warranty obligations at end of period | $ | 480 |  |  | $ | 932 |

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