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Balance Sheet Components - Accounts Receivable, Net, Prepaid Expenses and Other Current Assets, Inventories, Property and Equipment, Net (Detail) (USD $) In Thousands, unless otherwise specified | Apr. 03, 2015 | Dec. 31, 2014
--- | --- | ---
Accounts receivable, net: |  |  |  |
Accounts receivable | $ 80,974 us-gaap_AccountsReceivableGrossCurrent |  | $ 81,201 us-gaap_AccountsReceivableGrossCurrent |
Less: allowances for doubtful accounts, returns and discounts | (5,110)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |  | (7,057)us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent |
Total | 75,864 us-gaap_AccountsReceivableNetCurrent |  | 74,144 us-gaap_AccountsReceivableNetCurrent |
Prepaid expenses and other current assets: |  |  |  |
Prepaid inventories to contract manufacturer(1) | 14,200 us-gaap_Supplies | [1] | 0 us-gaap_Supplies | [1]
Prepaid software license to Vislink(2) | 1,090 us-gaap_OtherAssetsCurrent | [2] | 1,233 us-gaap_OtherAssetsCurrent | [2]
Other Prepayments | 9,953 us-gaap_OtherPrepaidExpenseCurrent |  | 9,713 us-gaap_OtherPrepaidExpenseCurrent |
Deferred cost of revenue | 3,364 us-gaap_AmountOfDeferredCostsRelatedToLongTermContracts |  | 2,524 us-gaap_AmountOfDeferredCostsRelatedToLongTermContracts |
Income tax receivable | 1,664 us-gaap_PrepaidTaxes |  | 2,316 us-gaap_PrepaidTaxes |
Other | 255 us-gaap_OtherAssetsMiscellaneousCurrent |  | 1,753 us-gaap_OtherAssetsMiscellaneousCurrent |
Prepaid Expense and Other Assets, Current | 30,526 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |  | 17,539 us-gaap_PrepaidExpenseAndOtherAssetsCurrent |
Inventories: |  |  |  |
Raw materials | 1,844 us-gaap_InventoryRawMaterialsNetOfReserves |  | 1,422 us-gaap_InventoryRawMaterialsNetOfReserves |
Work-in-process | 1,439 us-gaap_InventoryWorkInProcessNetOfReserves |  | 1,255 us-gaap_InventoryWorkInProcessNetOfReserves |
Finished goods | 28,235 us-gaap_InventoryFinishedGoodsNetOfReserves |  | 30,070 us-gaap_InventoryFinishedGoodsNetOfReserves |
Total inventories, net | 31,518 us-gaap_InventoryNet |  | 32,747 us-gaap_InventoryNet |
Property and equipment, net: |  |  |  |
Furniture and fixtures | 7,690 us-gaap_FurnitureAndFixturesGross |  | 7,691 us-gaap_FurnitureAndFixturesGross |
Machinery and equipment | 116,895 us-gaap_MachineryAndEquipmentGross |  | 116,031 us-gaap_MachineryAndEquipmentGross |
Leasehold improvements | 9,550 us-gaap_LeaseholdImprovementsGross |  | 8,140 us-gaap_LeaseholdImprovementsGross |
Property and equipment, gross | 134,135 us-gaap_PropertyPlantAndEquipmentGross |  | 131,862 us-gaap_PropertyPlantAndEquipmentGross |
Less: accumulated depreciation and amortization | (106,995)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |  | (104,641)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment |
Property and equipment, net | $ 27,140 us-gaap_PropertyPlantAndEquipmentNet |  | $ 27,221 us-gaap_PropertyPlantAndEquipmentNet |
[1] | In the first quarter of 2015, the Company made a $14.2 million advance payment for future inventory requirements to a supplier in order to secure more favorable pricing. The Company anticipates that this amount will begin to offset in the fourth quarter of 2015 through the first quarter of 2016 against the accounts payable owed to this supplier.
[2] | The prepaid inventories were related to prepayment for software licenses made to Vislink (see Note 4, “Investments in Other Equity Securities,” for additional information on Vislink).

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- Definition Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 3 -Subparagraph a, b -Article 5 + Details
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