Components of Other Current Liabilities and Deferred Revenue and Customer Advances - Schedule of Other Current Liabilities and Deferred Revenue and Customer Advances (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Components Of Other Current Liabilities And Deferred Revenue And Customer Advances [Abstract]
Accrued legal	$ 444	$ 410
Income taxes payable	14	30
Other current liabilities	577	582
Total other current liabilities	1,035	1,022
Deferred revenue	13,989	3,920
Customer advances	1	14
Total deferred revenue and customer advances	$ 13,990	$ 3,934