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BALANCE SHEETS (Parenthetical) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 25,000,000us-gaap_PreferredStockSharesAuthorized 25,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Common stock, shares authorized 250,000,000us-gaap_CommonStockSharesAuthorized 250,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 31,934,682us-gaap_CommonStockSharesIssued 31,934,682us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 3,766,289us-gaap_CommonStockSharesOutstanding 3,766,289us-gaap_CommonStockSharesOutstanding
Series A Redeemable Convertible Preferred Stock    
Convertible preferred stock, par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
$ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
Convertible preferred stock, shares authorized 0us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
35,377,556us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
Convertible preferred stock, shares issued 0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
34,349,894us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
Convertible preferred stock, shares outstanding 0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
34,349,894us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesARedeemableConvertiblePreferredStockMember
Series B Convertible Preferred Stock    
Convertible preferred stock, par value $ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
$ 0.001us-gaap_TemporaryEquityParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
Convertible preferred stock, shares authorized 0us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
27,081,680us-gaap_TemporaryEquitySharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
Convertible preferred stock, shares issued 0us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
27,081,680us-gaap_TemporaryEquitySharesIssued
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
Convertible preferred stock, shares outstanding 0us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember
27,081,680us-gaap_TemporaryEquitySharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= rare_SeriesBConvertiblePreferredStockMember