Description of Business and Summary of Significant Accounting Policies (Concentration) (Details) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
USD ($)
segment
|
Dec. 31, 2016
USD ($)
|
Dec. 31, 2015
USD ($)
|
|
| Revenue from U.S., Canadian and all other international dealers and distributors combined | |||
| Total revenue | $ 244,725 | $ 208,802 | $ 163,179 |
| International revenue (excluding Canada) as a percent of total revenue | 22.00% | 21.00% | 24.00% |
| Segment Reporting | |||
| Number of operating segments | segment | 1 | ||
| United States | |||
| Revenue from U.S., Canadian and all other international dealers and distributors combined | |||
| Total revenue | $ 169,930 | $ 148,803 | $ 109,435 |
| Canada | |||
| Revenue from U.S., Canadian and all other international dealers and distributors combined | |||
| Total revenue | 20,812 | 16,084 | 14,285 |
| All other international sources | |||
| Revenue from U.S., Canadian and all other international dealers and distributors combined | |||
| Total revenue | $ 53,983 | $ 43,915 | $ 39,459 |