Segment Information - Long Lived Assets (Details) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 1,388 | $ 894 |
| United States | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 763 | 283 |
| Hong Kong | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 140 | 204 |
| China | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | 199 | 252 |
| Other foreign countries | ||
| Segment Reporting Information [Line Items] | ||
| Long-lived assets | $ 286 | $ 155 |