Stockholder's Equity and Stock Based Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Stock Compensation Expense
Total stock-based compensation expense	$ 5,911	$ 2,616	$ 10,918	$ 3,617
Total unrecognized compensation cost related to unvested awards not yet recognized
Unrecognized Expense	58,969		58,969
Expected Recognition Period			3 years 7 days
Employee Stock Purchase Plan
Stock Compensation Expense
Total stock-based compensation expense			1,200
Total unrecognized compensation cost related to unvested awards not yet recognized
Unrecognized Expense	275		275
Expected Recognition Period			1 month 17 days
Stock options
Total unrecognized compensation cost related to unvested awards not yet recognized
Unrecognized Expense	21,769		21,769
Expected Recognition Period			2 years 5 months 16 days
RSUs
Total unrecognized compensation cost related to unvested awards not yet recognized
Unrecognized Expense	36,925		36,925
Expected Recognition Period			3 years 4 months 13 days
Cost of subscription and support revenue
Stock Compensation Expense
Total stock-based compensation expense	419	114	803	177
Cost of professional services and other revenue
Stock Compensation Expense
Total stock-based compensation expense	610	154	1,057	247
Research and development
Stock Compensation Expense
Total stock-based compensation expense	1,173	937	2,252	1,147
Sales and marketing
Stock Compensation Expense
Total stock-based compensation expense	2,095	863	3,874	1,093
General and administrative
Stock Compensation Expense
Total stock-based compensation expense	$ 1,614	$ 548	$ 2,932	$ 953