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Financial Statement Details | 12 Months Ended
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Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2019 |  | 2018
Finished goods | $ | 21,229 |  |  | $ | 14,797 |
Raw materials and components | 4,061 |  |  | 11,634 |
| $ | 25,290 |  |  | $ | 26,431 |
Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2019 |  | 2018
Land | $ | 253 |  |  | $ | 247 |
Buildings | 2,303 |  |  | 2,247 |
Test equipment | 10,952 |  |  | 14,444 |
Computer equipment and purchased software | 6,911 |  |  | 4,889 |
Product tooling | 2,139 |  |  | 504 |
Furniture and fixtures | 1,535 |  |  | 677 |
Vehicles | 2,535 |  |  | 1,990 |
Leasehold improvements | 145 |  |  | 136 |
| 26,773 |  |  | 25,134 |
Less—accumulated depreciation and amortization | (16,017 | ) |  | (18,436 | )
| $ | 10,756 |  |  | $ | 6,698 |
At December 31, 2019, the Company had vehicles and equipment under capital leases with an aggregate carrying value of $2.1 million, net of accumulated amortization of $2.6 million. 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. Rental Assets Rental assets consist of the following (in thousands):
| December 31,
| 2019 |  | 2018
Rental assets | $ | 18,176 |  |  | $ | 16,648 |
Less—accumulated depreciation | (12,791 | ) |  | (10,879 | )
| $ | 5,385 |  |  | $ | 5,769 |
Depreciation and amortization expense related to property, plant and equipment, including equipment under capital leases, and rental assets was $8.8 million and $7.0 million for the years ended December 31, 2019 and 2018, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2019 |  | 2018
Royalties | $ | 1,415 |  |  | $ | 1,727 |
Payroll and related expenses | 2,716 |  |  | 2,415 |
Professional fees | 483 |  |  | 514 |
Accrued interest | 1,543 |  |  | 239 |
Deferred revenue | 2,235 |  |  | 2,048 |
Operating lease liabilities | 1,101 |  |  | — |
Acquisition-related liabilities | 1,000 |  |  | 1,000 |
Other | 7,368 |  |  | 5,081 |
| $ | 17,861 |  |  | $ | 13,024 |
Cash, Cash Equivalents and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the consolidated statements of cash flows (in thousands):
| December 31,
| 2019 |  | 2018
Cash and cash equivalents | $ | 12,074 |  |  | $ | 31,015 |
Restricted cash | — |  |  | 61 |
Total cash, cash equivalents and restricted cash | $ | 12,074 |  |  | $ | 31,076 |

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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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