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Shareholders’ Equity (Narrative) (Details) (USD $)
 1 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 9 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 1 Months Ended
Dec. 31, 2014
party
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Jan. 25, 2014
Feb. 28, 2015
Sep. 30, 2013
Sep. 24, 2013
Sep. 30, 2013
Jul. 23, 2014
Jul. 31, 2014
Aug. 27, 2014
Aug. 26, 2014
Jan. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized   100,000,000us-gaap_CommonStockSharesAuthorized               100,000,000us-gaap_CommonStockSharesAuthorized 12,000,000,000us-gaap_CommonStockSharesAuthorized  
Preferred stock, shares authorized   8,000,000us-gaap_PreferredStockSharesAuthorized                        
Preferred stock, par value   $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period       0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value   $ 18.89us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue $ 7.51us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                      
Unamortized share-based compensation expense   $ 14,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions                        
Recognized weighted average period   3 years 4 months 24 days                        
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period   7,500us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised   0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value   111,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue                        
Warrants Granted To Purchase Common Stock 51,000ljpc_WarrantsGrantedToPurchaseCommonStock                          
Warrants Issued, Number of Third Party Recipients 2ljpc_WarrantsIssuedNumberofThirdPartyRecipients                          
Third party share-based compensation expense 198,000ljpc_WarrantGrantstoThirdPartiesCompensationExpense 496,000ljpc_WarrantGrantstoThirdPartiesCompensationExpense 0ljpc_WarrantGrantstoThirdPartiesCompensationExpense                      
Share-based compensation expense   3,402,000us-gaap_AllocatedShareBasedCompensationExpense 2,698,000us-gaap_AllocatedShareBasedCompensationExpense                      
Research and development [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based compensation expense   1,047,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 367,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		                      
General and administrative [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based compensation expense   2,355,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 2,331,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		                      
Stock Option [Member] | Research and development [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based compensation expense   558,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 8,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		                      
Stock Option [Member] | General and administrative [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Share-based compensation expense   589,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 23,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		                      
Restricted Stock [Member] | Research and development [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Recognized weighted average period   10 months                        
Share-based compensation expense   478,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		 359,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		                      
Unamortized share-based compensation expense   1,060,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember		                        
Restricted Stock [Member] | General and administrative [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Recognized weighted average period   10 months                        
Share-based compensation expense   1,579,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		 2,308,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		                      
Unamortized share-based compensation expense   5,257,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember		                        
Common Stock [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Period of share-based payment awards       13 months                    
Series C-1 Preferred Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Preferred stock, shares authorized 11,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		 11,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		   11,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                    
Preferred stock, par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		 $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		   0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                    
Shares issued upon conversion, per share   1,724us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                        
Preferred stock, shares issued 3,917us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		 3,917us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		   3,917us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                    
Shares reserved for future issuance   6,752,908us-gaap_ConvertiblePreferredStockSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                        
Liquidation preference per share $ 1,000us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		     1,000us-gaap_TemporaryEquityLiquidationPreferencePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                    
Liquidation preference 3,917,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		     3,917,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember		                    
Series C-1 Preferred Stock [Member] | Common Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued       5,341,670us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                    
Series F Preferred Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Preferred stock, shares authorized 10,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		 10,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		   10,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                    
Preferred stock, par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		 $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		   0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                    
Shares issued upon conversion, per share   286us-gaap_ConvertiblePreferredStockSharesIssuedUponConversion
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                        
Preferred stock, shares issued 2,798us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		 2,737us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		   2,798us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                    
Shares reserved for future issuance   782,032us-gaap_ConvertiblePreferredStockSharesReservedForFutureIssuance
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                        
Liquidation preference 2,737,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		     2,737,000us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember		                    
Series F Preferred Stock [Member] | Common Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued   17,360us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		   129,105us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		                    
Consultant [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Period of share-based payment awards   3 years                        
Stock options granted   60,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember		                        
Share-based compensation expense   298,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember		                        
Consultant [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued         2,976us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember		                  
Stock Issued During Period, Value, New Issues         25,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember		                  
Director [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Stock options granted           300,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		                
Share-based Compensation Arrangement by Share-based Payment Award, Award Approval Period           1 year                
Director [Member] | Common Stock [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued             79,622us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember		              
Employees [Member] | Common Stock [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued             336,185us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_EmployeesMember		              
Officer [Member] | Common Stock [Member] | Restricted Stock [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock issued             1,327,048us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember		              
2013 Equity Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Equity plan, term                 10 years          
Period of share-based payment awards                 4 years          
Automatic annual increase based on outstanding shares of Common Stock as of the last day of the previous year end, percent               10.00%ljpc_SharebasedCompensationArrangementbySharebasedPaymentAwardNumberofAdditionalSharesAuthorizedPercentofCommonStockOutstanding
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember		            
Shares available for grant   208,204us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember		                   1,100,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember		   440,441us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
Common Stock, Capital Shares Reserved for Future Issuance   1,089,524us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember		                        
2013 Equity Plan [Member] | Director [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Period of share-based payment awards                 3 years          
One-year Anniversary Date of Grant [Member] | Director [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting rights, percentage           25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= ljpc_OneyearAnniversaryDateofGrantMember		                
One-year Anniversary Date of Grant [Member] | 2013 Equity Plan [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting rights, percentage                 25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
/ us-gaap_VestingAxis
= ljpc_OneyearAnniversaryDateofGrantMember		          
One-year Anniversary Date of Grant [Member] | 2013 Equity Plan [Member] | Director [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting rights, percentage                 33.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
/ us-gaap_VestingAxis
= ljpc_OneyearAnniversaryDateofGrantMember		          
Upon Grant [Member] | Consultant [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Award vesting rights, percentage   25.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember
/ us-gaap_VestingAxis
= ljpc_UponGrantMember		                        
Underwriting Agreement [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock to be issued and sold in underwriting agreement                   4,800,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_UnderwritingAgreementMember		        
Term of option to purchase additional shares                   30 days        
Proceeds from the underwriting agreement, including additional shares sold, gross                   56,600,000ljpc_SaleofStockConsiderationReceivedonTransactionGross
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_UnderwritingAgreementMember		        
Proceeds from the underwriting agreement, including additional shares sold, net of cost                   53,100,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_UnderwritingAgreementMember		 53,100,000us-gaap_SaleOfStockConsiderationReceivedOnTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_UnderwritingAgreementMember		      
Issuance costs                   $ 3,500,000ljpc_SaleOfStockIssuanceCostsOnTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_UnderwritingAgreementMember		        
IPO [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Price per share of shares sold (usd per share)                   $ 10.50us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember		        
Over-Allotment Option [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Shares of common stock to be issued and sold in underwriting agreement                   595,000us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_OverAllotmentOptionMember		        
Number of additional shares available                   720,000ljpc_SaleofStockOptiontoPurchaseAdditionalSharesAdditionalSharesAvailable
/ us-gaap_SubsidiarySaleOfStockAxis
= ljpc_OverAllotmentOptionMember		        
Grant One [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Class of Warrant or Right, Award Vesting Period 4 years                          
Grant One [Member] | One-year Anniversary Date of Grant [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Class of Warrant or Right, Award Vesting Rights, Percentage 25.00%ljpc_ClassofWarrantorRightAwardVestingRightsPercentage
/ us-gaap_ClassOfWarrantOrRightAxis
= ljpc_GrantOneMember
/ us-gaap_VestingAxis
= ljpc_OneyearAnniversaryDateofGrantMember		                          
Grant Two [Member] | One-year Anniversary Date of Grant [Member]                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                            
Class of Warrant or Right, Award Vesting Rights, Percentage 100.00%ljpc_ClassofWarrantorRightAwardVestingRightsPercentage
/ us-gaap_ClassOfWarrantOrRightAxis
= ljpc_GrantTwoMember
/ us-gaap_VestingAxis
= ljpc_OneyearAnniversaryDateofGrantMember