Accrued Liabilities (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011		Sep. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Accrued Liabilities [Abstract]
Accrued compensation and related charges	$ 1,099		$ 1,807
Current portion of royalty payments	913		1,375
Accrued product warranty	697	740	1,003		812	877	740
Accrued professional services	689		650
Accrued income taxes	526		306
Advances from customers	242		74
Loan commitment for related party notes receivable	0		868
Other accrued liabilities	2,634		1,514
Accrued liabilities, total	$ 6,800		$ 7,597	[1]

[1] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.