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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, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Equity Based Compensation Related To Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	$ 49	$ 50	$ 113	$ 76
Cost of revenue
Equity Based Compensation Related To Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	12	9	28	14
Research and development
Equity Based Compensation Related To Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	9	11	21	16
Selling and marketing
Equity Based Compensation Related To Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	14	15	33	24
General and administrative
Equity Based Compensation Related To Employee Stock Purchase Programs [Line Items]
Stock-Based Compensation Expense	$ 14	$ 15	$ 31	$ 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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