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Condensed Balance Sheets (Parenthetical) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 100,000,000us-gaap_CommonStockSharesAuthorized 100,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 15,250,840us-gaap_CommonStockSharesIssued 15,225,980us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 15,250,840us-gaap_CommonStockSharesOutstanding 15,225,980us-gaap_CommonStockSharesOutstanding
Preferred stock, par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare  
Preferred stock, shares authorized 8,000,000us-gaap_PreferredStockSharesAuthorized  
Series C-1 Convertible Preferred Stock [Member]    
Preferred stock, par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
$ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
Preferred stock, shares authorized 11,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
11,000us-gaap_PreferredStockSharesAuthorized
/ 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
Preferred stock, shares outstanding 3,917us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
3,917us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesCOneConvertiblePreferredStockMember
Series F Convertible Preferred Stock [Member]    
Preferred stock, par value $ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
$ 0.0001us-gaap_PreferredStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
Preferred stock, shares authorized 10,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
10,000us-gaap_PreferredStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
Preferred stock, shares issued 2,737us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
2,798us-gaap_PreferredStockSharesIssued
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
Preferred stock, shares outstanding 2,737us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember
2,798us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= ljpc_SeriesFConvertiblePreferredStockMember