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CAPITAL STRUCTURE, COMMON STOCK WARRANTS (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Class of Warrant or Right [Line Items]      
Proceeds from the exercise of common stock warrants $ 0us-gaap_ProceedsFromWarrantExercises $ 1,826us-gaap_ProceedsFromWarrantExercises  
Exercise of common stock warrants (in shares) 611,606rptp_ExerciseOfCommonStockWarrantsShares    
Common stock warrants outstanding [Abstract]      
Number of Shares Exercisable (in shares) 334,764us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights    
Exercise Price (in dollars per share) $ 4.54us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 [1]    
Issued in Connection with Encode Merger [Member]      
Common stock warrants outstanding [Abstract]      
Number of Shares Exercisable (in shares) 233,309us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_IssuedInConnectionWithEncodeMergerMember
   
Exercise Price (in dollars per share) $ 2.87us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_IssuedInConnectionWithEncodeMergerMember
   
Expiration Date Dec. 13, 2015    
TorreyPines warrants assumed in 2009 Merger [Member]      
Common stock warrants outstanding [Abstract]      
Number of Shares Exercisable (in shares) 3,503us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_Merger2009Member
   
Exercise Price (in dollars per share) $ 157.08us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_Merger2009Member
   
Expiration Date Sep. 26, 2015    
Issued to Placement Agent in Aug. 2010 [Member]      
Common stock warrants outstanding [Abstract]      
Number of Shares Exercisable (in shares) 97,952us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_IssuedToPlacementAgentInAugust2010Member
   
Exercise Price (in dollars per share) $ 3.08us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_IssuedToPlacementAgentInAugust2010Member
   
Expiration Date Aug. 12, 2015    
August 2010 Private Placement, Investors and Placement Agent [Member]      
Assumptions to obtain the fair value of the warrants [Abstract]      
Fair value $ 766us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  $ 711us-gaap_LiabilitiesFairValueDisclosure
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
Black Scholes inputs [Abstract]      
Stock price (in dollars per share) $ 10.87us-gaap_SharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  $ 10.28us-gaap_SharePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
Exercise price (in dollars per share) $ 3.08us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  $ 3.08us-gaap_FairValueAssumptionsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
Risk free interest rate (in hundredths) 0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  0.12%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
Volatility (in hundredths) 95.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  95.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
Expected term (years) 0 years 5 months 1 day   0 years 6 months
Dividend (in hundredths) 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
  0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= rptp_August2010PrivatePlacementInvestorsAndPlacementAgentMember
[1] Weighted-average exercise price