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Condensed Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Convertible preferred stock, shares authorized 1,860,000us-gaap_TemporaryEquitySharesAuthorized  
Convertible preferred stock, shares outstanding 865,429us-gaap_TemporaryEquitySharesOutstanding  
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 10,000,000us-gaap_CommonStockSharesAuthorized 10,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 535,685us-gaap_CommonStockSharesIssued 535,685us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 535,685us-gaap_CommonStockSharesOutstanding 535,685us-gaap_CommonStockSharesOutstanding
Series A convertible preferred stock [Member]    
Convertible preferred stock, par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, shares authorized 40,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
40,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, shares issued 31,250us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
31,250us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, shares outstanding 31,250us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
31,250us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Convertible preferred stock, aggregate liquidation preference $ 1,500us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
$ 1,500us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
Series B convertible preferred stock [Member]    
Convertible preferred stock, par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
$ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Convertible preferred stock, shares authorized 320,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
320,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Convertible preferred stock, shares issued 119,140us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
119,140us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Convertible preferred stock, shares outstanding 119,140us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
119,140us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Convertible preferred stock, aggregate liquidation preference 6,863us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
6,863us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
Series C convertible preferred stock [Member]    
Convertible preferred stock, par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
$ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Convertible preferred stock, shares authorized 1,500,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
1,500,000us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Convertible preferred stock, shares issued 715,039us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
715,039us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Convertible preferred stock, shares outstanding 715,039us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
715,039us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
Convertible preferred stock, aggregate liquidation preference $ 15,445us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember
$ 15,445us-gaap_TemporaryEquityLiquidationPreference
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesCPreferredStockMember