CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 154,126	$ 338,696
Marketable securities	145,983	48,966
Accounts receivable	6,001us-gaap_AccountsReceivableNetCurrent	2,251us-gaap_AccountsReceivableNetCurrent
Prepaids and other current assets	8,541	8,253
Deferred taxes	187us-gaap_DeferredTaxAssetsNetCurrent	205us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	314,838us-gaap_AssetsCurrent	398,371us-gaap_AssetsCurrent
Intangible assets, net	89,371us-gaap_FiniteLivedIntangibleAssetsNet	117,172us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill	116,899us-gaap_Goodwill	116,899us-gaap_Goodwill
Property, plant and equipment, net	64,023us-gaap_PropertyPlantAndEquipmentNet	72,642us-gaap_PropertyPlantAndEquipmentNet
Deferred taxes, long term	536us-gaap_DeferredTaxAssetsNetNoncurrent	4,797us-gaap_DeferredTaxAssetsNetNoncurrent
Other assets	2,612us-gaap_OtherAssetsNoncurrent	3,498us-gaap_OtherAssetsNoncurrent
Total assets	588,279us-gaap_Assets	713,379us-gaap_Assets
Current liabilities:
Accounts payable	6,962us-gaap_AccountsPayableCurrent	7,001us-gaap_AccountsPayableCurrent
Accrued salaries and benefits	14,840	33,448
Convertible notes, short-term	0us-gaap_ConvertibleNotesPayableCurrent	164,047us-gaap_ConvertibleNotesPayableCurrent
Deferred Revenue, Current	4,133us-gaap_DeferredRevenueCurrent	466us-gaap_DeferredRevenueCurrent
Other current liabilities	8,723us-gaap_OtherAccruedLiabilitiesCurrent	7,880us-gaap_OtherAccruedLiabilitiesCurrent
Total current liabilities	34,658us-gaap_LiabilitiesCurrent	212,842us-gaap_LiabilitiesCurrent
Convertible notes, long-term	115,089us-gaap_ConvertibleLongTermNotesPayable	109,629us-gaap_ConvertibleLongTermNotesPayable
Long-term imputed financing obligation	39,063rmbs_LongTermImputedFinancingObligation	39,349rmbs_LongTermImputedFinancingObligation
Long-term income taxes payable	2,769us-gaap_AccruedIncomeTaxesNoncurrent	6,561us-gaap_AccruedIncomeTaxesNoncurrent
Other long-term liabilities	5,078us-gaap_OtherLiabilitiesNoncurrent	4,769us-gaap_OtherLiabilitiesNoncurrent
Total liabilities	196,657us-gaap_Liabilities	373,150us-gaap_Liabilities
Commitments and contingencies (Notes 12 and 18)
Stockholders’ equity:
Convertible preferred stock, $.001 par value: Authorized: 5,000,000 shares; Issued and outstanding: no shares at December 31, 2014 and December 31, 2013	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common Stock, $.001 par value: Authorized: 500,000,000 shares; Issued and outstanding: 115,161,675 shares at December 31, 2014 and 113,459,390 shares at December 31, 2013	115us-gaap_CommonStockValue	113us-gaap_CommonStockValue
Additional paid in capital	1,153,435	1,128,148
Accumulated deficit	(761,526)	(787,727)
Accumulated other comprehensive loss	(402)	(305)
Total stockholders’ equity	391,622us-gaap_StockholdersEquity	340,229us-gaap_StockholdersEquity
Total liabilities and stockholders’ equity	$ 588,279	$ 713,379

The unamortized amount of long-term liabilities that an Entity assumes in consideration for the estimated fair value of the Entity's share of buildings in the build out of leased facilities plus any tenant improvement allowance received from landlords. As the Entity retains sufficient continuing involvement following the completion of construction, for accounting purposes, the Entity is treated as the owner of the leased facilities and to record an imputed financing obligation for its obligation to the legal owners.

No definition available.