Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Revenues:
Subscription	$ 46,820		$ 24,776		$ 86,361		$ 46,000
Professional services and other	9,954		4,709		17,844		8,697
Total revenues	56,774		29,485		104,205		54,697
Cost of revenues:
Subscription	14,239	[1]	4,764	[1]	25,251	[1]	9,215	[1]
Professional services and other	8,652	[1]	4,723	[1]	18,876	[1]	9,486	[1]
Total cost of revenues	22,891	[1]	9,487	[1]	44,127	[1]	18,701	[1]
Gross profit	33,883		19,998		60,078		35,996
Operating expenses:
Sales and marketing	26,909	[1]	12,086	[1]	46,216	[1]	20,395	[1]
Research and development	9,272	[1]	2,361	[1]	15,315	[1]	4,246	[1]
General and administrative	6,819	[1]	3,282	[1]	13,246	[1]	5,962	[1]
Total operating expenses	43,000	[1]	17,729	[1]	74,777	[1]	30,603	[1]
Income (loss) from operations	(9,117)		2,269		(14,699)		5,393
Interest and other income (expense), net	41		65		533		317
Income (loss) before provision for (benefit from) income taxes	(9,076)		2,334		(14,166)		5,710
Provision for (benefit from) income taxes	(352)		298		198		683
Net income (loss)	(8,724)		2,036		(14,364)		5,027
Net income (loss) per share attributable to common stockholders:
Basic	$ (0.32)		$ 0.02		$ (0.55)		$ 0.05
Diluted	$ (0.32)		$ 0.02		$ (0.55)		$ 0.04
Weighted-average shares used to compute net income (loss) per share attributable to common stockholders:
Basic	27,788,547		19,668,851		26,452,100		19,188,210
Diluted	27,788,547		29,584,225		26,452,100		28,933,574
Other comprehensive income (loss) before tax:
Foreign currency translation and remeasurement adjustments	(468)		(35)		(536)		193
Unrealized loss on investments	(17)				(17)
Provision for income taxes			48		60		48
Other comprehensive income (loss), net of tax	(485)		(83)		(613)		145
Comprehensive income (loss)	$ (9,209)		$ 1,953		$ (14,977)		$ 5,172

[1] Includes stock-based compensation as follows: Cost of revenues: Subscription $706, $167, $1238 and $323, Professional services and other $277, $42, $469 and $80, Sales and marketing $2,482, $285, $3,953 and $573, Research and development $1,541, $118, $2,202 and $261, General and administrative $1,451, $466, $2,513 and $596; for three months ended June 30, 2012 and 2011 and six months ended June 30, 2012 and 2011 respectively.