CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 26,201us-gaap_NetIncomeLoss	$ (33,748)us-gaap_NetIncomeLoss	$ (134,336)us-gaap_NetIncomeLoss
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Stock-based compensation	14,730us-gaap_ShareBasedCompensation	14,981us-gaap_ShareBasedCompensation	22,546us-gaap_ShareBasedCompensation
Depreciation	13,625us-gaap_Depreciation	15,451us-gaap_Depreciation	13,190us-gaap_Depreciation
Amortization of intangible assets	26,618us-gaap_AmortizationOfIntangibleAssets	28,909us-gaap_AmortizationOfIntangibleAssets	30,345us-gaap_AmortizationOfIntangibleAssets
Non-cash interest expense and amortization of convertible debt issuance costs	14,763	19,296	14,695
Impairment of goodwill and long-lived assets	0	17,751	35,471
Impairment of investment in non-marketable equity security	600	1,400	0
Deferred tax provision	2,310us-gaap_DeferredIncomeTaxExpenseBenefit	1,919us-gaap_DeferredIncomeTaxExpenseBenefit	3,728us-gaap_DeferredIncomeTaxExpenseBenefit
Non-cash restructuring	0us-gaap_RestructuringCosts	653us-gaap_RestructuringCosts	0us-gaap_RestructuringCosts
Loss on disposal of property, plant and equipment	0	364	8
Gain from sale of intellectual property	(3,529)	(1,388)	0
Change in operating assets and liabilities, net of effects of acquisitions:
Accounts receivable	(3,750)	(1,722)	497
Prepaids and other assets	(2,431)	6,174	8,379
Accounts payable	2,006	(1,544)	(9,664)
Accrued salaries and benefits and other accrued liabilities	(19,893)	533	(5,757)
Accrued litigation expenses	(232)	(9,324)	(680)
Income taxes payable	2,263	(716)	(3,522)
Deferred revenue	3,667	(7,647)	7,604
Net cash provided by (used in) operating activities	76,948	51,342	(17,496)
Cash flows from investing activities:
Purchases of property, plant and equipment	(7,204)	(6,938)	(21,809)
Acquisition of intangible assets	0	(2,656)	(1,700)
Purchases of marketable securities	(240,281)	(125,554)	(110,716)
Maturities of marketable securities	118,735	119,600	183,086
Proceeds from sale of marketable securities	24,986	11,020	0
Proceeds from sale of intellectual property and property, plant and equipment	5,859	2,255	0
Acquisition of businesses, net of cash acquired	0	0	(46,278)
Net cash provided by (used in) investing activities	(97,905)	(2,273)	2,583
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes	0us-gaap_ProceedsFromConvertibleDebt	138,000us-gaap_ProceedsFromConvertibleDebt	0us-gaap_ProceedsFromConvertibleDebt
Issuance costs related to issuance of convertible senior notes	0us-gaap_PaymentsOfDebtIssuanceCosts	(3,603)us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds received from issuance of common stock under employee stock plans	11,079	8,391	4,103
Payments under installment payment arrangement	(1,773)rmbs_PaymentsUnderInstallment	(1,829)rmbs_PaymentsUnderInstallment	(1,923)rmbs_PaymentsUnderInstallment
Principal payments against financing lease obligation	(322)	(178)	(522)
Repayment of senior convertible notes	(172,500)us-gaap_RepaymentsOfSeniorDebt	0us-gaap_RepaymentsOfSeniorDebt	0us-gaap_RepaymentsOfSeniorDebt
Net cash provided by (used in) financing activities	(163,516)	140,781	1,658
Effect of exchange rate changes on cash and cash equivalents	(97)	(138)	(5)
Net increase (decrease) in cash and cash equivalents	(184,570)	189,712	(13,260)
Cash and cash equivalents at beginning of year	338,696	148,984	162,244
Cash and cash equivalents at end of year	154,126	338,696	148,984
Cash paid during the period for:
Interest	5,861us-gaap_InterestPaidNet	8,625us-gaap_InterestPaidNet	8,625us-gaap_InterestPaidNet
Income taxes, net of refunds	20,691us-gaap_IncomeTaxesPaidNet	18,720us-gaap_IncomeTaxesPaidNet	16,384us-gaap_IncomeTaxesPaidNet
Non-cash investing and financing activities:
Non-cash obligation for property, plant and equipment	0	0	2,512
Property, plant and equipment received and accrued in accounts payable and other accrued liabilities	$ 548	$ 5,909	$ 1,709

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the issuance of a long-term debt instrument which can be exchanged for a specified amount of another security, typically the entity's common stock, at the option of the issuer or the holder.

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The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale of property, plant and equipment (capital expenditures), software, and other intangible assets.

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The cash outflow for a long-term debt where the holder has highest claim on the entity's asset in case of bankruptcy or liquidation during the period.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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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.

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