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Stock-Based Compensation Expense Resulting from ESPP (Detail) (2011 Employee Stock Purchase Plan, USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	$ 50	$ 76
Cost of revenue
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	9	14
Research and development
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	11	16
Selling and marketing
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	15	24
General and administrative
Equity Based Compensation Related to Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	$ 15	$ 22

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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