Other Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013
Other Accrued Liabilities [Abstract]
Accrued warranty, current, see Note 1	$ 665		$ 1,094
Accrued taxes, including liability for unrecognized tax benefit, see Note 13	1,362		1,023
Accrued sales return	7,651	[1]	16,046	[1]
Other accrued liabilities	3,344		3,869
Total other accrued liabilities	13,022		22,032
Sales returns liability roll forward [Abstract]
Balance at beginning of year	16,046	[1]	11,901
Additions that reduce net sales	35,771		47,916
Actual returns	(44,166)		(43,771)
Balance at end of year	$ 7,651	[1]	$ 16,046	[1]

[1] The activity in the sales returns liability account was as follows: December 31, 2014 2013 Balance at beginning of year $ 16,046 $ 11,901 Additions that reduce net sales 35,771 47,916 Actual returns (44,166) (43,771) Balance at end of year $ 7,651 $ 16,046