Property and Equipment (Details) - USD ($) $ in Thousands |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Property and equipment | ||
| Property and equipment, gross | $ 6,231 | $ 7,602 |
| Less accumulated depreciation and amortization | 3,336 | 3,892 |
| Property and equipment, net | 2,895 | 3,710 |
| Depreciation | ||
| Depreciation expense | 900 | 900 |
| Machinery and Equipment [Member] | ||
| Property and equipment | ||
| Property and equipment, gross | 2,029 | 2,598 |
| Furniture and Fixtures [Member] | ||
| Property and equipment | ||
| Property and equipment, gross | 963 | 1,031 |
| Software [Member] | ||
| Property and equipment | ||
| Property and equipment, gross | 41 | 666 |
| Leasehold Improvements [Member] | ||
| Property and equipment | ||
| Property and equipment, gross | $ 3,198 | $ 3,307 |