Segment Information and Information about Geographic Areas (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 item	Jun. 30, 2013	Dec. 31, 2013
Segment Information and Information about Geographic Areas
Number of business segment			1
Revenue and long-lived assets by geographic area
Revenue	$ 36,030	$ 22,504	$ 68,322	$ 42,240
Long-lived assets	15,489		15,489		13,856
United States
Revenue and long-lived assets by geographic area
Revenue	30,424	19,283	57,774	36,275
Long-lived assets	14,932		14,932		13,573
EMEA
Revenue and long-lived assets by geographic area
Revenue	2,849	1,609	5,504	3,017
Long-lived assets	213		213		280
Other
Revenue and long-lived assets by geographic area
Revenue	2,757	1,612	5,044	2,948
Long-lived assets	$ 344		$ 344		$ 3