Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 548 | $ 544 |
| Less Accumulated Depreciation | 416 | 388 |
| Total | 132 | 156 |
| Machinery and Equipment [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 384 | 322 |
| Tooling, Molds and Software [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | 58 | |
| Furniture and Fixtures [Member] | ||
| Property, Plant and Equipment [Line Items] | ||
| Property and equipment, gross | $ 164 | $ 164 |