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NET LOSS PER SHARE (Details)
0 Months Ended 1 Months Ended 12 Months Ended
Mar. 18, 2014
Feb. 28, 2014
Dec. 31, 2014
Proforma net loss per share      
Conversion ratio used to convert Class A Membership Interests on proforma basis to common shares to calculate the weighted average common shares 7us-gaap_StockholdersEquityNoteStockSplitConversionRatio1    
Class A Membership Interests      
Proforma net loss per share      
Conversion ratio used to convert Class A Membership Interests on proforma basis to common shares to calculate the weighted average common shares 7us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_MemberUnitsMember
7us-gaap_StockholdersEquityNoteStockSplitConversionRatio1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_MemberUnitsMember
 
Membership interests converted into shares of common stock 767,911us-gaap_ConversionOfStockSharesConverted1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_MemberUnitsMember
   
Stock options      
Proforma net loss per share      
Potentially dilutive shares not been included in the computation of diluted net loss per share as the result would be antidilutive     861,287us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_StockOptionMember
Warrants      
Proforma net loss per share      
Potentially dilutive shares not been included in the computation of diluted net loss per share as the result would be antidilutive     31,500us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_WarrantMember
Unvested common shares      
Proforma net loss per share      
Potentially dilutive shares not been included in the computation of diluted net loss per share as the result would be antidilutive     42,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= dprx_UnvestedCommonSharesMember