Balance Sheet Components - Property and Equipment (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Property and Equipment, net | ||
| Property and equipment, gross | $ 3,977 | $ 1,980 |
| Less: accumulated depreciation and amortization | (729) | (135) |
| Property and equipment, net | 3,248 | 1,845 |
| Laboratory equipment | ||
| Property and Equipment, net | ||
| Property and equipment, gross | 1,868 | 829 |
| Computer equipment and purchased software | ||
| Property and Equipment, net | ||
| Property and equipment, gross | 58 | 18 |
| Leasehold improvements | ||
| Property and Equipment, net | ||
| Property and equipment, gross | $ 2,051 | 74 |
| Construction in progress | ||
| Property and Equipment, net | ||
| Property and equipment, gross | $ 1,059 |