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Summary of Significant Accounting Policies - Warranty Accrual (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Movement in Standard Product Warranty Accrual
Balance at the beginning of year	$ 467	$ 363
Accruals/additions	443	439
Usage	(525)	(335)
Balance at end of period	$ 385	$ 467

- 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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