Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Net of issuance costs | $ 3,304 | $ 30 |
| Series E Redeemable Convertible Preferred Stock [Member] | ||
| Net of issuance costs | $ 94 | |