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Condensed Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Deficit (2014 Unaudited) (Parenthetical)
$ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Statement Of Stockholders Equity [Abstract]  
For cash, issuance costs $ 169
Warrant exchange, issuance costs $ 49