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SUBSEQUENT EVENTS (Details) (USD $)
12 Months Ended 1 Months Ended
Dec. 31, 2014
Apr. 30, 2014
Jan. 31, 2015
Subsequent Event [Line Items]      
Granted (in shares) 861,287us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross    
Grant price (in dollars per share) $ 13.90us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice    
Employee stock options      
Subsequent Event [Line Items]      
Granted (in shares)   7,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Vesting period   3 years  
Subsequent Event | Employee stock options      
Subsequent Event [Line Items]      
Granted (in shares)     251,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Employees     5
Grant price (in dollars per share)     $ 11.35us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Vesting percentage upon issuance     50.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Vesting period     24 months
RRD International, LLC | Subsequent Event      
Subsequent Event [Line Items]      
Term of services     6 months
Total product development expense     $ 600,000us-gaap_BusinessDevelopment
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= dprx_RRDInternationalLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Cash portion     450,000dprx_BusinessDevelopmentCashPortion
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= dprx_RRDInternationalLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Consulting expense     $ 150,000us-gaap_IssuanceOfStockAndWarrantsForServicesOrClaims
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= dprx_RRDInternationalLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Share Based Payments to Vendors (in units)     12,346us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionQuantityOfSecuritiesIssued
/ us-gaap_ShareBasedGoodsAndNonemployeeServicesTransactionBySupplierAxis
= dprx_RRDInternationalLLCMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember