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Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parentheticals)
$ in Thousands
12 Months Ended
Dec. 31, 2014
USD ($)
Convertible Preferred Stock [Member] | Series D Preferred Stock [Member]  
Issuance of Series D redeemable convertible preferred stock, discount associated with investors rights and obligations $ 6,639
Issuance of Series D redeemable convertible preferred stock, issuance costs 452
Issuance of Series D redeemable convertible preferred stock, issuance costs $ 452