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Condensed Statements of Operations (Parenthetical) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Related party revenue $ 0us-gaap_RevenueFromRelatedParties $ 0us-gaap_RevenueFromRelatedParties $ 750,000us-gaap_RevenueFromRelatedParties
Equity-based compensation 1,861,000us-gaap_ShareBasedCompensation 198,000us-gaap_ShareBasedCompensation 29,000us-gaap_ShareBasedCompensation
Research and development      
Equity-based compensation 1,013,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
158,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
11,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_ResearchAndDevelopmentExpenseMember
General and administrative      
Equity-based compensation $ 848,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 40,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember
$ 18,000us-gaap_ShareBasedCompensation
/ us-gaap_IncomeStatementLocationAxis
= us-gaap_GeneralAndAdministrativeExpenseMember