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Financial Statement Details | 12 Months Ended
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Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2021 |  | 2020
Finished goods | $ | 33,112 |  |  | $ | 27,009 |
Raw materials and components | 4,290 |  |  | 6,943 |
| $ | 37,402 |  |  | $ | 33,952 |
Prepaid expenses and other Prepaid expenses and other consists of the following (in thousands):
| December 31,
| 2021 |  | 2020
Rebate receivables | $ | 6,398 |  |  | $ | 5,992 |
Receivables from contract manufacturers | 2,626 |  |  | — |
Software licenses | 1,261 |  |  | 707 |
Insurance | 1,269 |  |  | 1,262 |
Deposits | 1,023 |  |  | 1,544 |
Financed assets | 323 |  |  | 218 |
Other | 724 |  |  | 478 |
| $ | 13,624 |  |  | $ | 10,201 |
Property, plant and equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2021 |  | 2020
Land | $ | — |  |  | $ | 244 |
Buildings | — |  |  | 2,213 |
Test equipment | 19,095 |  |  | 16,775 |
Computer equipment and purchased software | 7,618 |  |  | 7,899 |
Product tooling | 4,350 |  |  | 3,125 |
Furniture and fixtures | 1,214 |  |  | 1,310 |
Vehicles | 1,654 |  |  | 2,988 |
Leasehold improvements | 863 |  |  | 860 |
| 34,794 |  |  | 35,414 |
Less—accumulated depreciation and amortization | (26,692) |  |  | (21,715) |
| $ | 8,102 |  |  | $ | 13,699 |
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. At December 31, 2020, the Company had property, plant and equipment under finance leases with an aggregate carrying value of $2.6 million, net of accumulated amortization of $1.0 million. Rental assets Rental assets consist of the following (in thousands):
| December 31,
| 2021 |  | 2020
Rental assets | $ | 9,967 |  |  | $ | 21,863 |
Less—accumulated depreciation | (5,392) |  |  | (15,754) |
| $ | 4,575 |  |  | $ | 6,109 |
Depreciation and amortization Depreciation and amortization expense related to property, plant and equipment, including rental assets and property, plant and equipment under capital leases was $9.8 million, $10.0 million and $8.8 million for the years ended December 31, 2021, 2020 and 2019, respectively. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2021 |  | 2020
Royalties | $ | 2,243 |  |  | $ | 2,410 |
Payroll and related expenses | 9,326 |  |  | 6,006 |
Warranty obligations | 473 |  |  | 366 |
Professional fees | 502 |  |  | 921 |
Bank overdrafts | 370 |  |  | 160 |
Accrued interest | 877 |  |  | 888 |
Deferred revenue | 3,832 |  |  | 2,853 |
Operating lease liabilities | 1,769 |  |  | 1,619 |
Accrued contract manufacturing liabilities | 927 |  |  | 938 |
Liabilities related to financed assets | 1,593 |  |  | 2,686 |
Value added tax payables | 642 |  |  | 2,039 |
Other | 3,699 |  |  | 2,487 |
| $ | 26,253 |  |  | $ | 23,373 |

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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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