2.4.0.84020 - Disclosure - Summary of Significant Accounting Policies (Details)truefalseIn Thousands, unless otherwise specifiedfalse1false USDfalsefalse$D2013Q2YTD_SilverCreekPharmaceuticalsIncMemberhttp://www.sec.gov/CIK0001274792duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$2false USDfalsefalse$D2012Q2YTD_SilverCreekPharmaceuticalsIncMemberhttp://www.sec.gov/CIK0001274792duration2012-01-01T00:00:002012-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false falsefalse$I2012_SilverCreekPharmaceuticalsIncMemberhttp://www.sec.gov/CIK0001274792instant2012-12-31T00:00:000001-01-01T00:00:00PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD1false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse1false USDtruefalse$D2013Q2YTD_SilverCreekPharmaceuticalsIncMemberhttp://www.sec.gov/CIK0001274792duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseSilver Creekdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldimack_SilverCreekPharmaceuticalsIncMemberdei_LegalEntityAxisexplicitMemberUSDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170PureStandardhttp://www.xbrl.org/2003/instancepurexbrli0USDUSD$nanafalse0Silver Creek2true 3us-gaap_MinorityInterestLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Non-controlling Interest (Deficit)3false 4us-gaap_MinorityInterestOwnershipPercentageByParentus-gaap_truenainstantfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truetruefalse0.740.74falsefalsefalse2falsefalsefalse00falsefalsefalse3truetruefalse0.740.74falsefalsefalsenum:percentItemTypepureThe parent entity's interest in net assets of the subsidiary, expressed as a percentage.No definition available.false0Ownership interest (as a percent)4true 4us-gaap_MovementInMinorityInterestRollForwardus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Activity related to Non-controlling Interest (Deficit)5false 5us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterestus-gaap_truecreditinstantfalsefalsefalsefalsefalsetruefalsefalseperiodStartLabel1truefalsefalse9700097USD$falsetruefalse2truefalsefalse574000574USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.No definition available.false2Balance at the beginning of the period6false 5us-gaap_TemporaryEquityNetIncomeus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse-339000-339USD$falsefalsefalse2truefalsefalse-231000-231USD$falsefalsefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe portion of net income or loss attributable to temporary equity interest.No definition available.false2Net loss attributable to Silver Creek7false 5us-gaap_TemporaryEquityCarryingAmountAttributableToNoncontrollingInterestus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsetruefalseperiodEndLabel1truefalsefalse-242000-242USD$falsetruefalse2truefalsefalse343000343USD$falsetruefalse3falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryCarrying amount, attributable to noncontrolling interests, of an entity's issued and outstanding stock which is not included within permanent equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. Includes stock with a put option held by an ESOP and stock redeemable by a holder only in the event of a change in control of the issuer.No definition available.false2Balance at the end of the periodfalseSummary of Significant Accounting Policies (Details) (Silver Creek, USD $)ThousandsUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.merrimackpharma.com/role/DisclosureSummaryOfSignificantAccountingPoliciesDetails37