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Financial Statement Details | 12 Months Ended
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Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2020 |  | 2019
Finished goods | $ | 27,009 |  |  | $ | 21,229 |
Raw materials and components | 6,943 |  |  | 4,061 |
| $ | 33,952 |  |  | $ | 25,290 |
Property, Plant and Equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2020 |  | 2019
Land | $ | 244 |  |  | $ | 253 |
Buildings | 2,213 |  |  | 2,303 |
Test equipment | 16,775 |  |  | 10,952 |
Computer equipment and purchased software | 7,899 |  |  | 6,911 |
Product tooling | 3,125 |  |  | 2,139 |
Furniture and fixtures | 1,310 |  |  | 1,535 |
Vehicles | 2,988 |  |  | 2,535 |
Leasehold improvements | 860 |  |  | 145 |
| 35,414 |  |  | 26,773 |
Less—accumulated depreciation and amortization | (21,715) |  |  | (16,017) |
| $ | 13,699 |  |  | $ | 10,756 |
At December 31, 2020, the Company had vehicles and equipment under finance leases with an aggregate carrying value of $2.6 million, net of accumulated amortization of $1.0 million. At December 31, 2019, the Company had vehicles and equipment under finance leases with an aggregate carrying value of $2.1 million, net of accumulated amortization of $2.6 million. Rental Assets Rental assets consist of the following (in thousands):
| December 31,
| 2020 |  | 2019
Rental assets | $ | 21,863 |  |  | $ | 18,176 |
Less—accumulated depreciation | (15,754) |  |  | (12,791) |
| $ | 6,109 |  |  | $ | 5,385 |
Depreciation and amortization expense related to property, plant and equipment, including equipment under capital leases, and rental assets was $10.0 million and $8.8 million for the years ended December 31, 2020 and 2019, respectively. Accrued Expenses and Other Current Liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2020 |  | 2019
Royalties | $ | 2,410 |  |  | $ | 1,415 |
Payroll and related expenses | 6,006 |  |  | 2,716 |
Professional fees | 921 |  |  | 483 |
Accrued interest | 888 |  |  | 1,543 |
Deferred revenue | 2,853 |  |  | 2,235 |
Operating lease liabilities | 1,619 |  |  | 1,101 |
Acquisition-related liabilities | — |  |  | 1,000 |
Other | 8,676 |  |  | 7,555 |
| $ | 23,373 |  |  | $ | 18,048 |

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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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