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Balance Sheet Components (Tables) | 9 Months Ended
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Sep. 28, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Accounts Receivable, Net | The following tables provide details of selected balance sheet components (in thousands):
| September 28, 2018 |  | December 31, 2017
Accounts receivable, net: |  |  |
Accounts receivable | $ | 81,059 |  |  | $ | 74,475 |
Less: allowances for doubtful accounts and sales returns | (3,073 | ) |  | (4,631 | )
Total | $ | 77,986 |  |  | $ | 69,844 |
Inventories |
| September 28, 2018 |  | December 31, 2017
Inventories: |  |  |
Raw materials | $ | 1,374 |  |  | $ | 2,881 |
Work-in-process | 847 |  |  | 933 |
Finished goods | 9,966 |  |  | 10,130 |
Service-related spares | 11,146 |  |  | 12,032 |
Total | $ | 23,333 |  |  | $ | 25,976 |
Prepaid, and Other Current Assets |
| September 28, 2018 |  | December 31, 2017
Prepaid expenses and other current assets: |  |  |
French R&D tax credits receivable(1) | $ | 7,453 |  |  | $ | 6,609 |
Deferred cost of revenue | 4,700 |  |  | 4,440 |
Contract assets(2) | 3,656 |  |  | — |
Prepaid maintenance, royalty, rent, property taxes and value added tax | 3,609 |  |  | 3,867 |
Capitalized commission | 1,259 |  |  | — |
Restricted cash(3) | 222 |  |  | 530 |
Other | 3,327 |  |  | 3,485 |
Total | $ | 24,226 |  |  | $ | 18,931 |
(1) The Company’s TVN subsidiary in France (the “TVN French Subsidiary”) participates in the French Crédit d’Impôt Recherche program (the “R&D tax credits”) which allows companies to monetize eligible research expenses. The R&D tax credits can be used to offset against income tax payable to the French government in each of the four years after being incurred, or if not utilized, are recoverable in cash. The amount of R&D tax credits recoverable are subject to audit by the French government. The R&D tax credits receivable at September 28, 2018 were approximately $25.6 million and are expected to be recoverable from 2019 through 2022 with $7.5 million reported as a component of “Prepaid expenses and other current assets” and $18.1 million reported as a component of “Other long-term assets” on the Company’s Condensed Consolidated Balance Sheets. (2) Contract assets reflect the satisfied performance obligations for which the Company does not yet have an unconditional right to consideration. (3) Amounts represent cash collateral security for certain bank guarantees. These restricted funds are invested in bank deposits and cannot be withdrawn from the Company’s accounts without the prior written consent of the applicable secured party.
Property, Plant and Equipment |
| September 28, 2018 |  | December 31, 2017
Property and equipment, net: |  |  |
Machinery and equipment | $ | 88,167 |  |  | $ | 87,121 |
Capitalized software | 35,887 |  |  | 35,139 |
Leasehold improvements | 14,990 |  |  | 15,051 |
Furniture and fixtures | 6,506 |  |  | 6,534 |
Property and equipment, gross | 145,550 |  |  | 143,845 |
Less: accumulated depreciation and amortization | (121,399 | ) |  | (114,580 | )
Total | $ | 24,151 |  |  | $ | 29,265 |
Other Long Term Assets |
| September 28, 2018 |  | December 31, 2017
Other long-term assets: |  |  |
R&D tax credits receivable | $ | 18,104 |  |  | $ | 22,322 |
Deferred tax assets | 9,362 |  |  | 10,462 |
Equity investment | 3,593 |  |  | 3,593 |
Others(1) | 7,565 |  |  | 6,536 |
Total | $ | 38,624 |  |  | $ | 42,913 |
Accrued Liabilities |
| September 28, 2018 |  | December 31, 2017
Accrued and other current liabilities: |  |  |
Accrued employee compensation and related expenses | $ | 17,405 |  |  | $ | 16,414 |
Accrued warranty | 4,749 |  |  | 4,381 |
Customer deposits | 3,638 |  |  | 5,020 |
Contingent inventory reserves | 3,291 |  |  | 3,806 |
Accrued TVN VDP, current (1) | 2,100 |  |  | 3,186 |
Accrued royalty payments | 2,077 |  |  | 2,195 |
Accrued Avid litigation settlement, current | 1,500 |  |  | — |
Others | 15,974 |  |  | 13,703 |
Total | $ | 50,734 |  |  | $ | 48,705 |
(1) See Note 8, “Restructuring and related charges-TVN VDP,” for additional information on the Company’s TVN VDP liabilities.

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