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Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Change in accrued warranty expense        
Beginning balance $ 585 $ 487 $ 431 $ 455
Provision 52 28 263 239
Payments (25) (213) (82) (392)
Ending balance $ 612 $ 302 $ 612 $ 302