Description of Business and Summary of Significant Accounting Policies (Inventory) (Details) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
|
| Inventories | |||
| Inventory write-downs | $ 2,300 | $ 1,700 | $ 2,300 |
| Gain on inventory purchase commitment | $ 380 | ||