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
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 168	$ 267	$ 347
Additions (Reductions) Charged to Expense	230	188	215
Write-offs/Adjustments	(292)	(287)	(295)
Balance at End of Period	106	168	267
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	2,003	2,619	2,304
Additions (Reductions) Charged to Expense	(187)	(616)	315
Balance at End of Period	1,816	2,003	2,619
Deferred tax asset valuation allowance
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	820	1,301	6,861
Additions (Reductions) Charged to Expense	188	(614)	(5,560)
Write-offs/Adjustments	116	(133)
Balance at End of Period	$ 892	$ 820	$ 1,301