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Balance Sheet Details (Tables) | 9 Months Ended
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Oct. 02, 2021
Balance Sheet Related Disclosures [Abstract] |
Summary of accounts receivable, net | Accounts receivable, net consisted of the following (in thousands):
|  | October 2, 2021 |  | December 31, 2020
Accounts receivable |  | $ | 92,703 |  |  | $ | 70,824 |
Allowance for doubtful accounts |  | (774) |  |  | (1,405) |
|  | $ | 91,929 |  |  | $ | 69,419 |
Summary of inventory | Inventory consisted of the following (in thousands):
|  | October 2, 2021 |  | December 31, 2020
Raw materials |  | $ | 169 |  |  | $ | 34 |
Finished goods |  | 74,997 |  |  | 52,234 |
|  | $ | 75,166 |  |  | $ | 52,268 |
Summary of property and equipment, net | Property and equipment, net consisted of the following (in thousands):
|  | October 2, 2021 |  | December 31, 2020
Test equipment |  | $ | 38,876 |  |  | $ | 37,670 |
Software |  | 14,440 |  |  | 16,093 |
Computer equipment |  | 10,594 |  |  | 9,062 |
Furniture and fixtures |  | 1,733 |  |  | 2,069 |
Leasehold improvements |  | 1,189 |  |  | 1,345 |
Total |  | 66,832 |  |  | 66,239 |
Accumulated depreciation and amortization |  | (45,872) |  |  | (45,858) |
|  | $ | 20,960 |  |  | $ | 20,381 |
Schedule of other long-term assets | Other long-term assets consisted of the following (in thousands):
|  | October 2, 2021 |  | December 31, 2020
Intangible asset |  | $ | 7,543 |  |  | $ | 9,517 |
Other long-term assets |  | 3,471 |  |  | 2,648 |
|  | $ | 11,014 |  |  | $ | 12,165 |
Summary of accrued liabilities | Accrued liabilities consisted of the following (in thousands):
|  | October 2, 2021 |  | December 31, 2020
Compensation and related benefits |  | $ | 14,261 |  |  | $ | 23,740 |
Warranty and retrofit |  | 10,126 |  |  | 9,208 |
Component inventory held by suppliers |  | 4,606 |  |  | 3,992 |
Professional and consulting fees |  | 4,595 |  |  | 4,497 |
Taxes payable |  | 4,482 |  |  | 3,476 |
Current portion of revenue share obligations |  | 4,397 |  |  | 2,925 |
Customer advances or rebates |  | 4,358 |  |  | 8,374 |
Operating leases |  | 3,151 |  |  | 2,994 |
Freight |  | 2,587 |  |  | 1,955 |
Product returns |  | 1,749 |  |  | 1,888 |
Operations |  | 1,286 |  |  | 950 |
Other |  | 5,846 |  |  | 4,737 |
|  | $ | 61,444 |  |  | $ | 68,736 |
Product warranty activities | Changes in the Company’s accrued warranty and retrofit liability were as follows (in thousands):
|  | Three Months Ended |  | Nine Months Ended
|  | October 2, 2021 |  | September 26, 2020 |  | October 2, 2021 |  | September 26, 2020
Balance at beginning of period |  | $ | 9,911 |  |  | $ | 7,732 |  |  | $ | 9,208 |  |  | $ | 7,294 |
Provision for warranty and retrofit charged to cost of revenue |  | 769 |  |  | 1,716 |  |  | 2,974 |  |  | 4,341 |
Utilization of reserve |  | (554) |  |  | (892) |  |  | (2,056) |  |  | (3,079) |
Balance at end of period |  | $ | 10,126 |  |  | $ | 8,556 |  |  | $ | 10,126 |  |  | $ | 8,556 |
Restructuring and related costs | The following table summarizes restructuring activities (in thousands):
|  | Facilities |  | Severance and Related Benefits |  | Total
Balance as of December 31, 2020 |  | $ | 1,244 |  |  | $ | 132 |  |  | $ | 1,376 |
Cash payments |  | (193) |  |  | (132) |  |  | (325) |
Balance as of October 2, 2021 |  | $ | 1,051 |  |  | $ | — |  |  | $ | 1,051 |

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