Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 58		$ 122		$ 357
Additions Charged (Credited) to Costs and Expenses	57		(17)		(235)
Deductions	0		(47)	[1]	0
Balance at End of Year	115		58		122
Inventory Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	132		159		799
Additions Charged (Credited) to Costs and Expenses	142		64		279
Deductions	(38)	[1]	(91)	[1]	(919)	[1]
Balance at End of Year	$ 236		$ 132		$ 159

[1] represents write-offs.