Segment Information - Reconciliation of reportable segments' assets to consolidated total assets (Details 1) - USD ($) $ in Thousands |
Dec. 31, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | $ 14,373 | $ 17,035 |
| Continuing Operations | ||
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | 12,212 | 13,304 |
| Continuing Operations | Residential | ||
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | 7,159 | 9,229 |
| Continuing Operations | Sunetric | ||
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | 1,196 | 3,041 |
| Continuing Operations | Other | ||
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | 3,857 | 1,034 |
| Discontinued Operations | Commercial Segment | ||
| Segment Reporting, Asset Reconciling Item [Line Items] | ||
| Total assets | $ 2,161 | $ 3,731 |