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Financial Statement Details | 12 Months Ended
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Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2018 |  | 2017
Finished goods | $ | 14,797 |  |  | $ | 14,331 |
Raw materials and components | 11,634 |  |  | 6,072 |
| $ | 26,431 |  |  | $ | 20,403 |
Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2018 |  | 2017
Land | $ | 247 |  |  | $ | 288 |
Buildings | 2,247 |  |  | 2,614 |
Test equipment | 14,444 |  |  | 23,396 |
Computer equipment and purchased software | 4,889 |  |  | 5,548 |
Product tooling | 504 |  |  | 449 |
Furniture and fixtures | 677 |  |  | 564 |
Vehicles | 1,990 |  |  | 2,003 |
Leasehold improvements | 136 |  |  | 267 |
| 25,134 |  |  | 35,129 |
Less—accumulated depreciation and amortization | (18,436 | ) |  | (28,138 | )
| $ | 6,698 |  |  | $ | 6,991 |
At December 31, 2018, the Company had vehicles and equipment under capital leases with an aggregate carrying value of $1.9 million, net of accumulated amortization of $2.0 million. At December 31, 2017, the Company had vehicles and equipment under capital leases with an aggregate carrying value of $1.6 million, net of accumulated amortization of $1.5 million. Rental Assets Rental assets consist of the following (in thousands):
| December 31,
| 2018 |  | 2017
Rental assets | $ | 16,648 |  |  | $ | 16,602 |
Less—accumulated depreciation | (10,879 | ) |  | (9,039 | )
| $ | 5,769 |  |  | $ | 7,563 |
Depreciation and amortization expense related to property, plant and equipment, including equipment under capital leases, and rental assets was $7.0 million and $8.0 million for the years ended December 31, 2018 and 2017, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2018 |  | 2017
Royalties | $ | 1,727 |  |  | $ | 1,558 |
Payroll and related expenses | 2,415 |  |  | 2,870 |
Professional fees | 514 |  |  | 1,789 |
Accrued interest | 239 |  |  | 239 |
Deferred revenue | 2,048 |  |  | 1,823 |
Acquisition-related liabilities | 1,000 |  |  | 13,186 |
Other | 5,081 |  |  | 6,093 |
| $ | 13,024 |  |  | $ | 27,558 |

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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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