SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Allowance for Doubtful Accounts [Member]
Schedule of Valuation and Qualifying Accounts [Roll Forward]
Balance at Beginning of Year	$ 22	$ 21
Charged to Costs and Expenses	8	61
Charged to other Accounts	0	0
Deductions	(10)	(60)
Balance at End of Year	20	22
Allowance for Obsolete Inventories [Member]
Schedule of Valuation and Qualifying Accounts [Roll Forward]
Balance at Beginning of Year	2,311	1,561
Charged to Costs and Expenses	1,766	3,660
Charged to other Accounts	0	0
Deductions	(2,458)	(2,910)
Balance at End of Year	1,619	2,311
Valuation Allowance for Deferred Tax Assets [Member]
Schedule of Valuation and Qualifying Accounts [Roll Forward]
Balance at Beginning of Year	9,503	4,059
Charged to Costs and Expenses	795	5,474
Charged to other Accounts	0	0
Deductions	(1,779)	(30)
Balance at End of Year	8,519	9,503
Reserve for sales returns [Member]
Schedule of Valuation and Qualifying Accounts [Roll Forward]
Balance at Beginning of Year	528	389
Charged to Costs and Expenses	1,168	1,581
Deductions	(1,540)	(1,442)
Balance at End of Year	$ 156	$ 528