Segment information (Revenue, net) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| REVENUES | $ 51 | $ 5,069 | $ 1,921 |
| China [Member] | |||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| REVENUES | 42 | 751 | 1,184 |
| HONG KONG | |||
| Revenues from External Customers and Long-Lived Assets [Line Items] | |||
| REVENUES | $ 9 | $ 4,318 | $ 737 |