CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 28, 2015	Mar. 29, 2014
Cash Flows from Operating Activities:
Net income (loss)	$ 12,366us-gaap_NetIncomeLoss	$ (4,374)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	6,586us-gaap_DepreciationAndAmortization	6,314us-gaap_DepreciationAndAmortization
Amortization of debt discount and issuance costs	2,234	2,020
Amortization of premium on investments	954	828
Stock-based compensation expense	7,208us-gaap_ShareBasedCompensation	6,672us-gaap_ShareBasedCompensation
Other gain	(19)us-gaap_OtherNoncashIncomeExpense	(20)us-gaap_OtherNoncashIncomeExpense
Changes in assets and liabilities:
Accounts receivable	23,391	(6,762)
Inventory	(12,103)us-gaap_IncreaseDecreaseInInventories	(3,354)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	1,141	(3,797)
Accounts payable	(10,317)	(2,080)
Accrued liabilities and other expenses	(12,895)	(13,448)
Deferred revenue	2,797	(909)
Accrued warranty	(1,501)	3,477
Net cash provided by (used in) operating activities	19,842	(15,433)
Cash Flows from Investing Activities:
Purchase of available-for-sale investments	(80,022)	(80,223)
Proceeds from sale of available-for-sale investments	2,001	0
Proceeds from maturities of investments	91,280	57,063
Purchase of property and equipment	(7,367)	(5,608)
Change in restricted cash	352	(479)
Net cash provided by (used in) investing activities	6,244	(29,247)
Cash Flows from Financing Activities:
Proceeds from issuance of common stock	10,131	7,054
Minimum tax withholding paid on behalf of employees for net share settlement	(3,950)	(1,619)
Net cash provided by financing activities	6,181	5,435
Effect of exchange rate changes on cash	(139)	164
Net change in cash and cash equivalents	32,128	(39,081)
Cash and cash equivalents at beginning of period	86,495	124,330
Cash and cash equivalents at end of period	118,623	85,249
Supplemental disclosures of cash flow information:
Cash paid for income taxes, net of refunds	897us-gaap_IncomeTaxesPaid	303us-gaap_IncomeTaxesPaid
Supplemental schedule of non-cash financing activities:
Transfer of inventory to fixed assets	$ 1,403infn_TransferOfInventoryToFixedAssets	$ 603infn_TransferOfInventoryToFixedAssets

Value of inventory transferred to fixed assets in noncash transactions.

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Name:	us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_SupplementalCashFlowInformationAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration