Property and Equipment, net - Schedule of Property and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | $ 654 | $ 91 |
| Less: Accumulated depreciation | (165) | (58) |
| Property and Equipment, net | 489 | 33 |
| Lab Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 322 | |
| Computer Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 243 | $ 91 |
| Leasehold Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 66 | |
| Furniture and Fixtures [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | $ 23 |