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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details 2) (USD $)
3 Months Ended
Mar. 31, 2015
item
Jan. 15, 2015
Apr. 02, 2015
Marketable securities      
Number of securities in an unrealized loss position 11us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1    
Fair Value, Less Than 12 Months $ 5,397,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue    
Gross Unrealized Losses, Less than 12 months (4,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses    
Fair Value, Total 5,397,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue    
Gross Unrealized Losses, Total (4,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses    
Janssen Pharmaceuticals, Inc.      
Marketable securities      
Cash deposit to JPMorgan Chase Bank,N.A., (Escrow Agent)   500,000,000depo_BusinessCombinationCashEscrow
/ us-gaap_BusinessAcquisitionAxis
= depo_JanssenPharmaceuticalsIncMember
 
Subsequent event | Senior Secured Notes      
Marketable securities      
Principal amount     575,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorNotesMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Corporate debt securities      
Marketable securities      
Fair Value, Less Than 12 Months 5,397,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Gross Unrealized Losses, Less than 12 months (4,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Fair Value, Total 5,397,000us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
   
Gross Unrealized Losses, Total $ (4,000)us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember