Convertible Preferred Stock - Additional Information (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended			12 Months Ended										1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Jan. 31, 2012	Dec. 31, 2013 Sales and Marketing [Member]	Dec. 31, 2012 Sales and Marketing [Member]	Dec. 31, 2011 Sales and Marketing [Member]	Dec. 31, 2013 Research and Development [Member]	Dec. 31, 2012 Research and Development [Member]	Dec. 31, 2011 Research and Development [Member]	Dec. 31, 2013 General and Administrative [Member]	Dec. 31, 2012 General and Administrative [Member]	Dec. 31, 2011 General and Administrative [Member]	Dec. 31, 2013 Convertible Preferred Stock [Member]	Jan. 31, 2012 Common Stock [Member]	Jan. 31, 2012 Series F [Member]
Class of Stock [Line Items]
Preferred stock conversion rate	The Company's outstanding convertible preferred stock ("Series A Stock", "Series A-1 Stock", "Series B Stock", "Series C Stock", "Series D Stock," "Series E Stock," "Series F Stock" and "Series F-1 Stock") automatically converted at a rate of 1:1 into common stock.
Preferred stock conversion ratio	1
Dividends declared													$ 0
Number of shares of common stock repurchased														365
Issuance price of preferred stock															$ 12.30
Payments for repurchase of preferred stock														4,488
Aggregate estimated fair value of repurchased common stock			$ 1,898
Stock-based compensation expense		$ 2,590		$ 1,304	$ 1,005	$ 226	$ 1,346	$ 831	$ 163	$ 1,681	$ 2,673	$ 143