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Financial Statement Details | 12 Months Ended
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Dec. 31, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2022 |  | 2021
Finished goods | $ | 31,153 |  |  | $ | 33,112 |
Raw materials and components | 6,823 |  |  | 4,290 |
Total inventories | $ | 37,976 |  |  | $ | 37,402 |
Prepaid expenses and other Prepaid expenses and other consists of the following (in thousands):
| December 31,
| 2022 |  | 2021
Rebate receivables | $ | 2,038 |  |  | $ | 6,398 |
Receivables from contract manufacturers | 3,561 |  |  | 2,626 |
Software licenses | 772 |  |  | 1,261 |
Insurance | 12 |  |  | 1,269 |
Deposits | 829 |  |  | 1,023 |
Financed assets | — |  |  | 323 |
Other | 766 |  |  | 724 |
Total prepaid expenses and other | $ | 7,978 |  |  | $ | 13,624 |
Property, plant and equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2022 |  | 2021
Test equipment | $ | 19,724 |  |  | $ | 19,095 |
Computer equipment and purchased software | 4,603 |  |  | 7,618 |
Product tooling | 5,007 |  |  | 4,350 |
Furniture and fixtures | 1,214 |  |  | 1,214 |
Vehicles | 119 |  |  | 1,654 |
Leasehold improvements | 772 |  |  | 863 |
Total property, plant and equipment, gross | 31,439 |  |  | 34,794 |
Less—accumulated depreciation and amortization | (26,049) |  |  | (26,692) |
Total property, plant and equipment, net | $ | 5,390 |  |  | $ | 8,102 |
At December 31, 2022, the Company had property, plant and equipment under finance leases with an aggregate carrying value of $3.1 million, net of accumulated amortization of $2.1 million. At December 31, 2021, the Company had property, plant and equipment under finance leases with an aggregate carrying value of $3.1 million, net of accumulated amortization of $1.3 million. Rental assets Rental assets consist of the following (in thousands):
| December 31,
| 2022 |  | 2021
Rental assets | $ | 10,300 |  |  | $ | 9,967 |
Less—accumulated depreciation | (5,484) |  |  | (5,392) |
Total rental assets | $ | 4,816 |  |  | $ | 4,575 |
Depreciation and amortization Depreciation and amortization expense related to property, plant and equipment, including rental assets and property, plant and equipment under finance leases, was $7.1 million, $9.8 million and $10.0 million for the years ended December 31, 2022, 2021 and 2020, respectively. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2022 |  | 2021
Royalties | $ | 992 |  |  | $ | 2,243 |
Payroll and related expenses | 8,873 |  |  | 9,326 |
Warranty obligations | 480 |  |  | 473 |
Professional fees | 738 |  |  | 502 |
Bank overdrafts | — |  |  | 370 |
Accrued interest | 1,112 |  |  | 877 |
Deferred revenue | 5,060 |  |  | 3,832 |
Customer advances | 2,828 |  |  | — |
Operating lease liabilities | 1,759 |  |  | 1,769 |
Accrued contract manufacturing liabilities | 1,416 |  |  | 927 |
Liabilities related to financed assets | — |  |  | 1,593 |
Value added tax payables | 449 |  |  | 642 |
Other | 4,238 |  |  | 3,699 |
Total accrued expenses and other current liabilities | $ | 27,945 |  |  | $ | 26,253 |

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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://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI https://asc.fasb.org/topic&trid=2122208 + Details
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