Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Short-Term Investments (Details2)

v2.4.1.9
Cash, Cash Equivalents and Short-Term Investments (Details2) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Cash equivalents and available-for-sale securities    
Gross Unrealized Gains $ 34us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax $ 25us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses (17)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (32)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Fair Value 133,034us-gaap_InvestmentsFairValueDisclosure 132,957us-gaap_InvestmentsFairValueDisclosure
U S Treasury Securities    
Cash equivalents and available-for-sale securities    
Fair Value   2,010us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_USTreasurySecuritiesMember
U S Government Sponsored Enterprises Debt Securities    
Cash equivalents and available-for-sale securities    
Gross Unrealized Gains 6us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember 		4us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Gross Unrealized Losses (4)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember 		(11)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Fair Value 42,129us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember 		45,786us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Corporate Bond Securities And Commercial Paper    
Cash equivalents and available-for-sale securities    
Gross Unrealized Gains 28us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember 		21us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember
Gross Unrealized Losses (13)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember 		(21)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember
Fair Value $ 90,905us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember 		$ 85,161us-gaap_InvestmentsFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= rigl_CorporateBondSecuritiesAndCommercialPaperMember