Description of Business and Summary of Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
item
Mar. 31, 2014
Revenue from U.S., Canadian and all other international dealers and distributors combined    
Total revenue $ 32,083 $ 31,855
International revenue (excluding Canada) as a percent of total revenue 24.00% 24.00%
Number of operating segments 1  
United States    
Revenue from U.S., Canadian and all other international dealers and distributors combined    
Total revenue 21,217 21,043
Canada    
Revenue from U.S., Canadian and all other international dealers and distributors combined    
Total revenue 3,086 3,230
All other international sources    
Revenue from U.S., Canadian and all other international dealers and distributors combined    
Total revenue $ 7,780 $ 7,582