Fair Value Measurements (Details 1) $ in Thousands |
6 Months Ended |
|---|---|
|
Jun. 30, 2018
USD ($)
| |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Total fair value as of January 1, 2018 | $ 334 |
| Total fair value as of June 30, 2018 | 408 |
| Level 3 [Member] | |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | |
| Total fair value as of January 1, 2018 | 334 |
| Accretion of payments obligation | 22 |
| Total fair value as of June 30, 2018 | $ 356 |