Stock-Based Compensation Expense Resulting from Stock Bonus and Incentive Plans (Detail) (Share Bonus and Incentive Plans, USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	$ 116	$ 235	$ 282	$ 163
Cost of revenue
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	3		7	1
Research and development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	3	5	6	14
Selling and marketing
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	68	(7)	180	35
General and administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-Based Compensation Expense	$ 42	$ 237	$ 89	$ 113