Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) |
3 Months Ended | 9 Months Ended | |||
|---|---|---|---|---|---|
Sep. 30, 2016 |
Sep. 30, 2015 |
Sep. 30, 2016 |
Sep. 30, 2015 |
Dec. 31, 2015 |
|
| Incremental Direct Costs [Abstract] | |||||
| Advertising and marketing expenses | $ 657,000 | $ 1,506,000 | $ 1,482,000 | $ 4,227,000 | |
| Prepaid advertising costs | |||||