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	Sep. 30, 2013	Dec. 31, 2012
Components Of Other Current Liabilities And Deferred Revenue And Customer Advances [Abstract]
Accrued legal	$ 723	$ 410
Income taxes payable	26	30
Other current liabilities	630	582
Total other current liabilities	1,379	1,022
Deferred revenue	11,186	3,920
Customer advances	0	14
Total deferred revenue and customer advances	$ 11,186	$ 3,934