Summary of Business and Significant Accounting Policies (Details Textual) (USD $)	3 Months Ended				6 Months Ended				12 Months Ended	6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended
	Jun. 30, 2012 Customer		Jun. 30, 2011		Jun. 30, 2012 Customer		Jun. 30, 2011		Dec. 31, 2011 Customer	Jun. 30, 2012 Stock options and restricted units [Member]	Jun. 30, 2012 2012 ESPP [Member]	Jun. 30, 2012 Customer Concentration Risk [Member] Customer	Jun. 30, 2011 Customer Concentration Risk [Member] Customer	Jun. 30, 2012 Customer Concentration Risk [Member] Customer	Jun. 30, 2011 Customer Concentration Risk [Member] Customer	Mar. 31, 2012 Understatement [Member]
Summary of Business and Significant Accounting Policies (Textual) [Abstract]
Compensation expense recognized, vesting term					48 months					4 years	6 months
Number of customers exceeded revenues												0	0	0	0
Research and development	$ 9,272,000	[1]	$ 2,361,000	[1]	$ 15,315,000	[1]	$ 4,246,000	[1]								$ 700,000
Deferred revenue recognized, period					12 months
Summary of Business and Significant Accounting Policies (Additional Textual) [Abstract]
Compensation expense recognized, net of forfeiture activity, estimated annual percentage					4.00%
Number of customer accounted on accounts receivable balance	0				0				0
Percentage of accounts receivable, customer accounted					10.00%				10.00%
Percentage of revenues, customers exceeded individually					10.00%		10.00%
Software development cost					$ 1,100,000		$ 0

[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.