Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	$ 122		$ 357		$ 50
Additions Charged (Credited) to Costs and Expenses	(17)		(235)		313
Deductions	(47)	[1]	0		(6)	[1]
Balance at End of Year	58		122		357
Inventory Reserve [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Year	159		799		94
Additions Charged (Credited) to Costs and Expenses	64		279		924
Deductions	(91)	[1]	(919)	[1]	(219)	[1]
Balance at End of Year	$ 132		$ 159		$ 799

[1] represents write-offs.