Accrued Liabilities (Details) - USD ($) $ in Thousands |
Sep. 30, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Accrued Liabilities | ||
| Accrued Expenses | $ 562 | $ 924 |
| Inventory received not billed | 1,015 | 240 |
| Accrued Compensation | 424 | 476 |
| Other | 45 | 69 |
| Accrued Project Costs | 32 | 102 |
| Total | $ 2,078 | $ 1,811 |