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Share-Based Compensation - Narrative (Details) (USD $)
1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 0 Months Ended 3 Months Ended 0 Months Ended 9 Months Ended
Dec. 31, 2014
party
Dec. 31, 2014
Dec. 31, 2013
Sep. 24, 2013
Sep. 30, 2013
Mar. 31, 2014
Sep. 30, 2014
Jan. 25, 2014
Sep. 30, 2013
Aug. 27, 2014
Jan. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock options, forfeitures   0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod                
Weighted average grant-date fair values of options granted   $ 9.67us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue                  
Unrecognized compensation costs related to non-vested stock option awards $ 4,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions $ 4,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions                  
Service period of share compensation   3 years 82 days                  
Stock options, exercises   0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised                
Warrants granted to third parties to purchase common stock 51,000ljpc_WarrantsGrantedToPurchaseCommonStock                    
Number of third party recipients 2ljpc_WarrantsIssuedNumberofThirdPartyRecipients                    
Compensation expense related to warrants issued to third parties 63,000ljpc_WarrantGrantstoThirdPartiesCompensationExpense 63,000ljpc_WarrantGrantstoThirdPartiesCompensationExpense 0ljpc_WarrantGrantstoThirdPartiesCompensationExpense                
Issuance of stock   53,063,000us-gaap_StockIssuedDuringPeriodValueNewIssues 6,750,000us-gaap_StockIssuedDuringPeriodValueNewIssues                
2013 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
             
Common Stock, issuable shares 478,304us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
478,304us-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
Shares reserved for future issuance 1,097,204us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
1,097,204us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= ljpc_TwoThousandandThirteenPlanMember
                 
2013 Plan [Member] | One-year Anniversary Date of Grant [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
           
Director [Member] | 2013 Plan [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Period of share-based payment awards         3 years            
Director [Member] | 2013 Plan [Member] | One-year Anniversary Date of Grant [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
           
Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Non-option equity instruments, forfeitures           39,811us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
7,318us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
       
Restricted Stock [Member] | Consultant [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period               2,976us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember
     
Issuance of stock               25,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_ConsultantMember
     
Restricted Stock Units (RSUs) [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Unamortized share-based compensation expense 0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
0us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
               
Restricted stock units, cancellations       207,502ljpc_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsCancellationsinPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
             
Common Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period   5,395,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
1,929,000us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
               
Issuance of stock   1,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
2,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
               
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                  
Common Stock [Member] | Restricted Stock [Member] | Director [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period                 79,622us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_DirectorMember
   
Common Stock [Member] | Restricted Stock [Member] | Employees [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period                 336,185us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= ljpc_EmployeesMember
   
Common Stock [Member] | Restricted Stock [Member] | Officer [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock issued during period                 1,327,048us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_OfficerMember
   
Research and development [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Service period of share compensation   13 months                  
Unamortized share-based compensation expense 1,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
1,500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
                 
General and administrative [Member] | Restricted Stock [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Service period of share compensation   13 months                  
Unamortized share-based compensation expense $ 6,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 6,800,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember