Property and Equipment (Details) - USD ($) |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2016 |
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Property, Plant and Equipment [Abstract] | |||
| Depreciation expense | $ 147,000 | $ 222,000 | $ 304,000 |
| Property, Plant and Equipment, Disposals | 68,000 | 30,000 | |
| Gain (Loss) on Disposition of Property Plant Equipment | $ 3,000 | $ 14,000 | |