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Product Warranties (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Product warranty activity    
Balance at the beginning of the period $ 364 $ 572
Accruals for warranties for products sold in the period 29 82
Fulfillment of warranty obligations (47) (100)
Revisions of estimated obligations (22)  
Balance at the end of the period $ 324 $ 554