CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 102,994	$ 103,253
Short-term investments	31,394us-gaap_ShortTermInvestments	58,453us-gaap_ShortTermInvestments
Trade accounts receivable, net of allowances	15,510us-gaap_AccountsReceivableNetCurrent	15,257us-gaap_AccountsReceivableNetCurrent
Deferred costs, current portion	314us-gaap_DeferredCostsCurrent	702us-gaap_DeferredCostsCurrent
Deferred tax assets, net, current portion	651us-gaap_DeferredTaxAssetsNetCurrent	652us-gaap_DeferredTaxAssetsNetCurrent
Prepaid expenses and other current assets	8,278	8,980
Total current assets	159,141us-gaap_AssetsCurrent	187,297us-gaap_AssetsCurrent
Equipment, software, and leasehold improvements, at cost:
Equipment and software	71,840rnwk_EquipmentAndSoftwareGross	74,100rnwk_EquipmentAndSoftwareGross
Leasehold improvements	3,395us-gaap_LeaseholdImprovementsGross	3,590us-gaap_LeaseholdImprovementsGross
Total equipment, software, and leasehold improvements, at cost	75,235us-gaap_PropertyPlantAndEquipmentGross	77,690us-gaap_PropertyPlantAndEquipmentGross
Less accumulated depreciation and amortization	60,610	61,442
Net equipment, software, and leasehold improvements	14,625us-gaap_PropertyPlantAndEquipmentNet	16,248us-gaap_PropertyPlantAndEquipmentNet
Restricted cash equivalents and investments	3,000	3,000
Investment in and advances to Rhapsody	10,743us-gaap_EquityMethodInvestments	10,000us-gaap_EquityMethodInvestments
Available for sale securities	2,648	2,676
Other assets	3,761us-gaap_OtherAssetsNoncurrent	2,299us-gaap_OtherAssetsNoncurrent
Deferred costs, non-current portion	263us-gaap_DeferredCosts	316us-gaap_DeferredCosts
Deferred tax assets, net, non-current portion	899us-gaap_DeferredTaxAssetsNetNoncurrent	999us-gaap_DeferredTaxAssetsNetNoncurrent
Other intangible assets, net	9,700	10,109
Goodwill	16,839us-gaap_Goodwill	17,355us-gaap_Goodwill
Total assets	221,619us-gaap_Assets	250,299us-gaap_Assets
Current liabilities:
Accounts payable	18,315us-gaap_AccountsPayableCurrent	18,653us-gaap_AccountsPayableCurrent
Accrued and other current liabilities	22,052	25,286
Deferred tax liabilities, net, current portion	1,576us-gaap_DeferredTaxLiabilitiesCurrent	1,628us-gaap_DeferredTaxLiabilitiesCurrent
Deferred revenue, current portion	3,857us-gaap_DeferredRevenueCurrent	5,301us-gaap_DeferredRevenueCurrent
Total current liabilities	45,800us-gaap_LiabilitiesCurrent	50,868us-gaap_LiabilitiesCurrent
Deferred revenue, non-current portion	173us-gaap_DeferredRevenueNoncurrent	235us-gaap_DeferredRevenueNoncurrent
Deferred rent	1,207us-gaap_DeferredRentCreditNoncurrent	1,215us-gaap_DeferredRentCreditNoncurrent
Deferred tax liabilities, net, non-current portion	690	702
Other long-term liabilities	448us-gaap_OtherLiabilitiesNoncurrent	81us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	48,318us-gaap_Liabilities	53,101us-gaap_Liabilities
Commitments and contingencies
Preferred stock, $0.001 par value, no shares issued and outstanding:
Common stock, $0.001 par value authorized 250,000 shares; issued and outstanding 36,106 shares in 2015 and 36,099 shares in 2014	36us-gaap_CommonStockValue	36us-gaap_CommonStockValue
Additional paid-in capital	621,007us-gaap_AdditionalPaidInCapital	617,756us-gaap_AdditionalPaidInCapital
Accumulated other comprehensive loss	(57,931)	(55,252)
Retained deficit	(389,811)	(365,342)
Total shareholders’ equity	173,301us-gaap_StockholdersEquity	197,198us-gaap_StockholdersEquity
Total liabilities and shareholders’ equity	221,619	250,299
Preferred stock, Series A
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	0	0
Preferred stock, Undesignated series
Preferred stock, $0.001 par value, no shares issued and outstanding:
Preferred stock	$ 0	$ 0

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Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include computer and related equipment and software.

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Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount 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, reduced to the estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection.

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

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Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees. Use this element for the aggregate amount of additional paid-in capital associated with common and preferred stock. For additional paid-in capital associated with only common stock, use the element additional paid in capital, common stock. For additional paid-in capital associated with only preferred stock, use the element additional paid in capital, preferred stock.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Sum of the carrying amounts as of the balance sheet date of all assets that are expected to be realized in cash, sold, or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

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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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Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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Aggregate par or stated value of issued nonredeemable common stock (or common stock redeemable solely at the option of the issuer). This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' equity.

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Sum of the carrying amounts of deferred costs that are expected to be recognized as a charge against earnings in periods after one year or beyond the normal operating cycle, if longer.

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The carrying amount of consideration received or receivable as of the balance sheet date on potential earnings that were not recognized as revenue in conformity with GAAP, and which are expected to be recognized as such within one year or the normal operating cycle, if longer, including sales, license fees, and royalties, but excluding interest income.

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The noncurrent portion of deferred revenue amount as of balance sheet date. Deferred revenue is a liability related to a revenue producing activity for which revenue has not yet been recognized, and is not expected to be recognized in the next twelve months. Generally, an entity records deferred revenue when it receives consideration from a customer before achieving certain criteria that must be met for revenue to be recognized in conformity with GAAP.

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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