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Product Warranties - Product Warranty Activity (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Guarantees [Abstract]        
Balance at the beginning of the period $ 329 $ 461 $ 364 $ 572
Accruals for warranties for products sold in the period 127 161 228 379
Fulfillment of warranty obligations (110) (133) (220) (430)
Revisions of estimated obligations 1 (8) (25) (40)
Balance at the end of the period $ 347 $ 481 $ 347 $ 481