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MARKETABLE SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 77,751us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 31,329us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross Unrealized Gains    
Total available-for-sale securities, Gross Unrealized Gains 1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 16us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 4depo_GrossUnrealizedGainAccumulatedInCashCashEquivalentsAndInvestments 16depo_GrossUnrealizedGainAccumulatedInCashCashEquivalentsAndInvestments
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (18)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (2)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (20)depo_GrossUnrealizedLossAccumulatedInCashCashEquivalentsAndInvestments (2)depo_GrossUnrealizedLossAccumulatedInCashCashEquivalentsAndInvestments
Amortized Cost    
Marketable securities    
Cash and cash equivalents 488,667us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
244,674us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Gross Unrealized Gains    
Marketable securities    
Cash and cash equivalents 3us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= depo_GrossUnrealizedGainsMember
 
Gross Unrealized Losses    
Marketable securities    
Cash and cash equivalents (2)us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= depo_GrossUnrealizedLossesMember
 
Total Amortized Cost    
Fair Value    
Total cash, cash equivalents and marketable securities 566,418us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
276,003us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Fair Value    
Marketable securities    
Cash and cash equivalents 488,668us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
244,674us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value    
Total available-for-sale securities, Fair Value 77,734us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
31,343us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total cash, cash equivalents and marketable securities 566,402us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
276,017us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Corporate debt securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities 70,777us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
12,440us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities 6,974depo_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
4,075depo_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 1depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
8depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities   5depo_AvailableForSaleDebtSecuritiesDebtMaturitiesOneThroughTwoYearsGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (5)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(2)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities (13)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesOneThroughTwoYearsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Fair Value    
Total maturing within 1 year and included in marketable securities 70,773us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
12,446us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities 6,961depo_AvailableForSaleSecuritiesDebtMaturitiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
4,080depo_AvailableForSaleSecuritiesDebtMaturitiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
U.S. government agency debt securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities   14,814us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities   3depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Fair Value    
Total maturing within 1 year and included in marketable securities   14,817us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_USGovernmentAgenciesDebtSecuritiesMember
Cash | Amortized Cost    
Marketable securities    
Cash and cash equivalents 22,452us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
26,728us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Cash | Fair Value    
Marketable securities    
Cash and cash equivalents 22,452us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
26,728us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Money market funds | Amortized Cost    
Marketable securities    
Cash and cash equivalents 179,923us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
217,946us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Money market funds | Fair Value    
Marketable securities    
Cash and cash equivalents 179,923us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
217,946us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Corporate debt securities | Amortized Cost    
Marketable securities    
Cash and cash equivalents 286,292us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Corporate debt securities | Gross Unrealized Gains    
Marketable securities    
Cash and cash equivalents 3us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= depo_GrossUnrealizedGainsMember
 
Corporate debt securities | Gross Unrealized Losses    
Marketable securities    
Cash and cash equivalents (2)us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= depo_GrossUnrealizedLossesMember
 
Corporate debt securities | Fair Value    
Marketable securities    
Cash and cash equivalents $ 286,293us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CorporateDebtSecuritiesMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember