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CASH, CASH EQUIVALENTS AND MARKETABLE SECURITIES (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Amortized Cost    
Total available-for-sale securities, Amortized Cost $ 14,945us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis $ 77,751us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
Gross Unrealized Gains    
Total cash, cash equivalents and marketable securities, Gross Unrealized Gains 10depo_GrossUnrealizedGainAccumulatedInCashCashEquivalentsAndInvestments 4depo_GrossUnrealizedGainAccumulatedInCashCashEquivalentsAndInvestments
Total available-for-sale securities, Gross Unrealized Gains 10us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax 1us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Gross Unrealized Losses    
Total available-for-sale securities, Gross Unrealized Losses (4)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax (18)us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Total cash, cash equivalents and marketable securities, Gross Unrealized Losses (4)depo_GrossUnrealizedLossAccumulatedInCashCashEquivalentsAndInvestments (20)depo_GrossUnrealizedLossAccumulatedInCashCashEquivalentsAndInvestments
Amortized Cost    
Marketable securities    
Cash and cash equivalents 52,783us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
488,667us-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 67,728us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
566,418us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_PortionAtOtherThanFairValueFairValueDisclosureMember
Fair Value    
Marketable securities    
Cash and cash equivalents 52,783us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
488,668us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Fair Value    
Total available-for-sale securities, Fair Value 14,951us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
77,734us-gaap_AvailableForSaleSecuritiesDebtSecurities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Total cash, cash equivalents and marketable securities 67,734us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
566,402us-gaap_CashCashEquivalentsAndShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Corporate debt securities    
Amortized Cost    
Total maturing within 1 year and included in marketable securities 8,309us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
70,777us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities 6,636depo_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
6,974depo_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughTwoYearsAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Gross Unrealized Gains    
Total maturing within 1 year and included in marketable securities 3depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
1depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities 7depo_AvailableForSaleDebtSecuritiesDebtMaturitiesOneThroughTwoYearsGrossUnrealizedGain
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
 
Gross Unrealized Losses    
Total maturing within 1 year and included in marketable securities (2)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(5)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesWithinOneYearGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities (2)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesOneThroughTwoYearsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
(13)depo_AvailableForSaleDebtSecuritiesDebtMaturitiesOneThroughTwoYearsGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Fair Value    
Total maturing within 1 year and included in marketable securities 8,310us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
70,773us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Total maturing between 1 and 2 years and included in marketable securities 6,641depo_AvailableForSaleSecuritiesDebtMaturitiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
6,961depo_AvailableForSaleSecuritiesDebtMaturitiesDebtMaturitiesAfterOneThroughTwoYearsFairValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CorporateDebtSecuritiesMember
Cash | Amortized Cost    
Marketable securities    
Cash and cash equivalents 23,763us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
22,452us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
Cash | Fair Value    
Marketable securities    
Cash and cash equivalents 23,763us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CashMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
22,452us-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 12,521us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
179,923us-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 12,521us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
179,923us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_MoneyMarketFundsMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
Commercial Paper | Amortized Cost    
Marketable securities    
Cash and cash equivalents 16,499us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CommercialPaperMember
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
 
Commercial Paper | Fair Value    
Marketable securities    
Cash and cash equivalents 16,499us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_CashAndCashEquivalentsAxis
= us-gaap_CommercialPaperMember
/ 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