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SHARE-BASED COMPENSATION and STOCK OPTIONS (Details) (USD $)
0 Months Ended 12 Months Ended 1 Months Ended
Jul. 23, 2010
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Jul. 31, 2014
Dec. 31, 2013
item
Share-based compensation and stock options                
Fair value of the membership interests granted (in dollars per share) $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit    
Non-vested Class A Membership interests converted to common stock at a conversion ratio and the associated activity                
Nonvested at the beginning of the period (in shares)   77,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 111,986us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber          
Granted (in shares)     112,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod          
Forfeited (in shares)   (21,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod            
Vested (in shares)   (14,000)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod (146,986)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod          
Nonvested at the end of the period (in shares)   42,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 77,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber 111,986us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber       77,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Restricted Class A Membership Interests awards                
Share-based compensation and stock options                
Fair value of the membership interests granted (in dollars per share)   $ 50dprx_PrivatePlacementOfferingsUnitsIssuedPricePerUnit
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Number of members of the board of directors from whom entity has received resignation letters               6dprx_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfMembersOfBoardOfDirectorsFromWhomEntityHasReceivedResignationLetters
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Membership interests issued in connection with both the accelerated and annual vesting of the awards (in shares)               20,333us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Compensation expense associated with accelerated vesting               $ 693,750us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Total compensation expense recorded as director fees   125,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
1,077,777us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
         
Non-vested Class A Membership interests converted to common stock at a conversion ratio and the associated activity                
Forfeited (in shares)             21,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
Reduction in compensation   29,167us-gaap_SalariesAndWages
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
           
Additional disclosures                
Number of Membership Interests issued but not vested               1,000dprx_StockIssuedDuringPeriodSharesRestrictedStockAwardsWhichNotVested
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Restricted Class A Membership Interests awards | Minimum                
Share-based compensation and stock options                
Vesting period   3 years            
Restricted Class A Membership Interests awards | Maximum                
Share-based compensation and stock options                
Vesting period   4 years            
Non-vested Class A Membership Interests awards converted to Common Stock awards                
Additional disclosures                
Total unrecognized compensation cost   $ 220,833us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
           
Weighted average period over which total unrecognized compensation cost is expected to be recognized   2 years 3 months