Balance Sheet Items Balance Sheet Items - Inventory, Net (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Organization, Consolidation and Presentation of Financial Statements [Abstract] | ||
| Raw materials | $ 3,422 | $ 4,118 |
| Finished goods | 0 | 38 |
| Inventory in-transit | 0 | 29 |
| Less: reserve for obsolescence | (303) | (335) |
| Inventory, net | $ 3,119 | $ 3,850 |