CONSOLIDATED STATEMENTS OF CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' DEFICIT (Parenthetical) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Issuance cost | $ 3,548 | ||
| Series A redeemable convertible preferred stock | |||
| Net of issuance cost | $ 13 | ||
| Series B convertible preferred stock | |||
| Net of issuance cost | $ 433 | ||
| Series C convertible preferred stock | |||
| Net of issuance cost | $ 214 | ||