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
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	$ 106	$ 168	$ 267
Additions (Reductions) Charged to Expense	403	230	188
Write-offs/Adjustments	(399)	(292)	(287)
Balance at End of Period	110	106	168
Allowance for sales returns
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	1,816	2,003	2,619
Additions (Reductions) Charged to Expense	1,154	(187)	(616)
Balance at End of Period	2,970	1,816	2,003
Deferred tax asset valuation allowance
VALUATION AND QUALIFYING ACCOUNTS
Balance at Beginning of Period	892	820	1,301
Additions (Reductions) Charged to Expense	(35)	188	(614)
Write-offs/Adjustments	5	(116)	133
Balance at End of Period	$ 862	$ 892	$ 820