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Balance Sheet Details | 12 Months Ended
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Dec. 31, 2022
Balance Sheet Related Disclosures [Abstract] |
Balance Sheet Details | Balance Sheet Details Accounts receivable, net consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Accounts receivable |  | $ | 94,201 |  |  | $ | 85,944 |
Allowance for doubtful accounts |  | (397) |  |  | (725) |
|  | $ | 93,804 |  |  | $ | 85,219 |
The table below summarizes the changes in allowance for doubtful accounts and product return liability for the periods indicated (in thousands):
|  | Balance at Beginning of Year |  | Additions Charged to Expenses or Revenue Net of Recoveries |  | Write Offs and Returns |  | Balance at End of Year
Year Ended December 31, 2022: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 725 |  |  | $ | (276) |  |  | $ | (52) |  |  | $ | 397 |
Product return liability |  | 1,836 |  |  | 5,622 |  |  | (4,497) |  |  | 2,961 |
Year Ended December 31, 2021: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 1,405 |  |  | $ | (201) |  |  | $ | (479) |  |  | $ | 725 |
Product return liability |  | 1,888 |  |  | 3,681 |  |  | (3,733) |  |  | 1,836 |
Year Ended December 31, 2020: |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  | $ | 374 |  |  | $ | 1,085 |  |  | $ | (54) |  |  | $ | 1,405 |
Product return liability |  | 919 |  |  | 3,391 |  |  | (2,422) |  |  | 1,888 |
Inventory consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Raw materials |  | $ | 640 |  |  | $ | 130 |
Finished goods |  | 148,520 |  |  | 88,750 |
|  | $ | 149,160 |  |  | $ | 88,880 |
Prepaid expenses and other current assets consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Supplier deposits |  | $ | 39,064 |  |  | $ | 6,191 |
Prepaid expenses and other current assets |  | 23,627 |  |  | 24,620 |
|  | $ | 62,691 |  |  | $ | 30,811 |
Property and equipment, net consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Test equipment |  | $ | 44,106 |  |  | $ | 39,476 |
Computer equipment |  | 13,396 |  |  | 11,156 |
Software |  | 10,389 |  |  | 9,013 |
Leasehold improvements |  | 1,730 |  |  | 1,351 |
Furniture and fixtures |  | 1,153 |  |  | 1,812 |
|  | 70,774 |  |  | 62,808 |
Accumulated depreciation and amortization |  | (44,940) |  |  | (41,025) |
|  | $ | 25,834 |  |  | $ | 21,783 |
Depreciation and amortization expenses were $14.3 million, $15.0 million and $13.7 million for the years ended December 31, 2022, 2021 and 2020, respectively. Other long-term assets consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Intangible asset |  | $ | 4,253 |  |  | $ | 6,885 |
Other long-term assets |  | 14,889 |  |  | 6,800 |
|  | $ | 19,142 |  |  | $ | 13,685 |
Intangible Asset Acquisition In March 2018, and as amended in December 2020, the Company entered into an agreement with a vendor to develop a certain software product and related enhancements pursuant to which the Company is obligated to make revenue-share payments under the program, subject to aggregate fixed revenue-share payments of $15.8 million. The payments are based on a revenue-share rate applied to revenue from the developed-product and the corresponding hardware sales through March 2024. If the minimum revenue-share payments are not achieved by the end of that period, a true-up payment will be due. As of December 31, 2022, the liability, including accrued interest, was $11.4 million, of which $7.2 million is included in “Accrued liabilities” and $4.2 million in “Other long-term liabilities” in the accompanying Consolidated Balance Sheet. As of December 31, 2021, the liability, including accrued interest, was $13.2 million, of which $4.7 million was included in “Accrued liabilities” and $8.5 million in other “Other long-term liabilities.” Accrued liabilities consisted of the following (in thousands):
|  | December 31,
|  | 2022 |  | 2021
Compensation and related benefits |  | $ | 27,813 |  |  | $ | 23,165 |
Component inventory held by suppliers |  | 10,280 |  |  | 7,611 |
Professional and consulting fees |  | 7,307 |  |  | 4,819 |
Current portion of revenue-share payments |  | 7,210 |  |  | 4,731 |
Current portion of warranty and retrofit |  | 6,377 |  |  | 7,076 |
Customer advances or rebates |  | 5,653 |  |  | 4,742 |
Taxes payable |  | 4,581 |  |  | 4,251 |
Operating leases |  | 3,949 |  |  | 3,596 |
Freight |  | 3,649 |  |  | 3,997 |
Business events |  | 3,167 |  |  | — |
Product returns |  | 2,961 |  |  | 1,836 |
Other |  | 7,527 |  |  | 5,773 |
|  | $ | 90,474 |  |  | $ | 71,597 |
Changes in the Company’s accrued warranty and retrofit liability were as follows (in thousands):
|  | Years Ended December 31,
|  | 2022 |  | 2021 |  | 2020
Balance at beginning of year |  | $ | 9,594 |  |  | $ | 9,208 |  |  | $ | 7,294 |
Provision for warranty and retrofit charged to cost of revenue |  | 1,315 |  |  | 3,370 |  |  | 5,888 |
Utilization of reserve |  | (2,523) |  |  | (2,984) |  |  | (3,974) |
Balance at end of year |  | $ | 8,386 |  |  | $ | 9,594 |  |  | $ | 9,208 |
Accrued Restructuring Charges The Company initiated a restructuring plan in 2020 to accelerate the Company’s platform future and to align with a work-from-anywhere culture. The Company incurred restructuring charges of approximately $6.3 million, consisting of facilities-related charges and severance and other termination related benefits for the year ended December 31, 2020. In the fourth quarter of 2021, as a result of subleasing the abandoned portion of the Company’s San Jose headquarters, the Company reversed $0.8 million in facilities-related charges due to the expected recovery of accrued common areas maintenance fees. As of December 31, 2022, the Company had no accrued restructuring charges in the accompanying Consolidated Balance Sheet.

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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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