Consolidated Statements of Changes in Redeemable Convertible Preferred Stock and Stockholders' Equity (Deficit) (Parenthetical) $ in Thousands |
12 Months Ended |
|---|---|
|
Dec. 31, 2014
USD ($)
| |
| Issuance of redeemable convertible preferred stock, issuance costs | $ 2,312 |
| Series E Preferred Stock [Member] | |
| Issuance of redeemable convertible preferred stock, issuance costs | $ 1 |