Components of Other Current Liabilities and Deferred Revenue and Customer Advances (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of other current liabilities and deferred revenue and customer advances
Accrued legal	$ 410	$ 727
Income taxes payable	30	23
Other current liabilities	582	1,304
Total other current liabilities	1,022	2,054
Deferred revenue	3,920	4,046
Customer advances	14	74
Total deferred revenue and customer advances	$ 3,934	$ 4,120