Variable Interest Entities (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2015 |
Jun. 30, 2014 |
Jun. 30, 2015 |
Jun. 30, 2014 |
|
| Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 16,600 | $ 16,600 | ||
| Net Income (Loss) Attributable to Noncontrolling Interest | (647) | $ (789) | (1,380) | $ (1,483) |
| Variable Interest Entity, Consolidated, Carrying Amount, Liabilities | 600 | 600 | ||
| Cash and Cash Equivalents [Member] | ||||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets | 12,100 | 12,100 | ||
| Patents [Member] | ||||
| Variable Interest Entity, Consolidated, Carrying Amount, Assets | $ 4,400 | $ 4,400 | ||