Property and Equipment, net - Schedule of Property and Equipment, net (Detail) - USD ($) $ in Thousands |
Dec. 31, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | $ 6,034 | $ 4,003 |
| Less: Accumulated depreciation | (2,939) | (2,221) |
| Property and equipment, net | 3,095 | 1,782 |
| Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 3,359 | 2,606 |
| Leasehold Improvements [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 894 | 815 |
| Furniture and Fixtures [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 403 | 295 |
| Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | 54 | 25 |
| Construction in Progress [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and Equipment, gross | $ 1,324 | $ 262 |