Consolidated Statements of Redeemable Convertible Preferred Stock and Stockholders' Equity (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Underwriting fees and issuance costs | $ 445 | $ 10,751 |
| Series C Redeemable Convertible Preferred Stock [Member] | ||
| Underwriting fees and issuance costs | $ 445 | |