Description of Business and Summary of Significant Accounting Policies (Details 3) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2014
Product Warranty  
Product warranty period 2 years
Changes in the product warranty liability  
Balance at beginning of period $ 1,213
Warranty costs accrued 458
Warranty claims (517)
Balance at end of period $ 1,154