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Statements of Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Issuance Costs $ 1,500us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts $ 163us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts $ 109us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Initial Public Offering ("IPO") [Member]      
Issuance Costs $ 7,300us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember