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Summary of Significant Accounting Policies (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Product warranty liability
Balance, beginning of period	$ 253	$ 98
Charged to cost of sales	(37)	241
Actual product warranty expenditures	(115)	(86)
Balance, end of period	$ 101	$ 253

- 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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