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Financial Statement Details | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Financial Statement Details | Financial Statement Details Inventories Inventories consist of the following (in thousands):
| December 31,
| 2023 |  | 2022
Finished goods | $ | 21,264 |  |  | $ | 31,153 |
Raw materials and components | 1,616 |  |  | 6,823 |
Total inventories | $ | 22,880 |  |  | $ | 37,976 |
During the year ended December 31, 2023, t he Company record ed a write-down of $9.6 million to reflect inventories at net realizable value, in addition to a $1.3 million write-off of capitalized inventory order fees. Further, management accrued an additional $6.8 million in net charges for contract manufacturing liabilities (whose remaining balance is accrued in the Accrued Expenses and Other Current Liabilities section below) related to excess materials at the contract manufacturers’ sites. All $17.7 million of these charges are recorded i n product cost of revenues on the consolidated statement of operations. Prepaid expenses and other Prepaid expenses and other consists of the following (in thousands):
| December 31,
| 2023 |  | 2022
Rebate receivables | $ | 1,950 |  |  | $ | 2,038 |
Receivables from contract manufacturers | 1,823 |  |  | 3,561 |
Other | 1,438 |  |  | 2,379 |
Total prepaid expenses and other | $ | 5,211 |  |  | $ | 7,978 |
Property, plant and equipment Property, plant and equipment consists of the following (in thousands):
| December 31,
| 2023 |  | 2022
Test equipment | $ | 19,717 |  |  | $ | 19,724 |
Computer equipment and purchased software | 4,590 |  |  | 4,603 |
Product tooling | 5,153 |  |  | 5,007 |
Furniture and fixtures | 1,331 |  |  | 1,214 |
Vehicles | 115 |  |  | 119 |
Leasehold improvements | 772 |  |  | 772 |
Total property, plant and equipment, gross | 31,678 |  |  | 31,439 |
Less—accumulated depreciation and amortization | (28,920) |  |  | (26,049) |
Total property, plant and equipment, net | $ | 2,758 |  |  | $ | 5,390 |
Rental assets Rental assets consist of the following (in thousands):
| December 31,
| 2023 |  | 2022
Rental assets | $ | 12,086 |  |  | $ | 10,300 |
Less—accumulated depreciation | (7,003) |  |  | (5,484) |
Total rental assets | $ | 5,083 |  |  | $ | 4,816 |
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 $6.1 million and $7.1 million for the years ended December 31, 2023 and 2022, respectively. Accrued expenses and other current liabilities Accrued expenses and other current liabilities consist of the following (in thousands):
| December 31,
| 2023 |  | 2022
Royalties | $ | 845 |  |  | $ | 992 |
Payroll and related expenses | 4,159 |  |  | 8,873 |
Warranty obligations | 480 |  |  | 480 |
Professional fees | 310 |  |  | 738 |
Accrued interest | 1,038 |  |  | 1,112 |
Deferred revenue | 5,583 |  |  | 5,060 |
Customer advances | — |  |  | 2,828 |
Operating lease liabilities | 1,681 |  |  | 1,759 |
Accrued contract manufacturing liabilities | 7,537 |  |  | 1,416 |
Value added tax payables | 531 |  |  | 449 |
Other | 4,858 |  |  | 4,238 |
Total accrued expenses and other current liabilities | $ | 27,022 |  |  | $ | 27,945 |

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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 -Topic 210 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//210/tableOfContent + Details
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