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3. Accrued product warranty liability (Details) - Warranty Activity (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Warranty Activity [Abstract]
Balance, beginning of period	$ 274
Warranties issued	408
Warranty settlements	(292)
Balance, end of period	$ 390

- Definition

Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers.

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