Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Subscription		$ 83,929	$ 68,947	$ 162,678	$ 132,758
Professional services		14,155	14,276	27,846	27,105
Total revenues		98,084	83,223	190,524	159,863
Cost of revenues
Subscription		12,354	11,221	23,827	22,307
Professional services		10,557	9,753	21,260	19,466
Total cost of revenues	[1],[2]	22,911	20,974	45,087	41,773
Gross profit		75,173	62,249	145,437	118,090
Operating costs and expenses:
Research and development	[2]	22,519	17,311	44,430	35,100
Sales and marketing	[1],[2]	25,724	20,425	50,042	41,157
General and administrative	[2]	21,943	17,373	42,512	34,419
Total operating costs and expenses		70,186	55,109	136,984	110,676
Operating income		4,987	7,140	8,453	7,414
Interest and other income (expense):
Interest expense		(3,997)	(3,827)	(7,955)	(7,608)
Interest income		612	420	1,146	815
Other (expense) income, net		(34)	(28)	(68)	6
Total interest and other expense, net		(3,419)	(3,435)	(6,877)	(6,787)
Income before income taxes		1,568	3,705	1,576	627
Provision for income taxes		55	1,409	(94)	146
Net income		$ 1,513	$ 2,296	$ 1,670	$ 481
Earnings per share:
Basic		$ 0.03	$ 0.04	$ 0.03	$ 0.01
Diluted		$ 0.03	$ 0.04	$ 0.03	$ 0.01
Weighted average common shares outstanding:
Basic		53,647	52,457	53,453	52,284
Diluted		56,191	54,828	56,050	54,998
Total stock-based compensation	[2]	$ 14,136	$ 8,630	$ 25,806	$ 18,329
Total amortization of intangible assets	[1]	210	141	418	279
Cost of revenues
Weighted average common shares outstanding:
Total stock-based compensation	[2]	1,311	1,027	2,559	2,099
Total amortization of intangible assets	[1]	180	111	359	219
Research and development
Weighted average common shares outstanding:
Total stock-based compensation	[2]	2,013	817	3,799	1,729
Sales and marketing
Weighted average common shares outstanding:
Total stock-based compensation	[2]	2,460	1,060	4,827	3,411
Total amortization of intangible assets	[1]	30	30	59	60
General and administrative
Weighted average common shares outstanding:
Total stock-based compensation	[2]	$ 8,352	$ 5,726	$ 14,621	$ 11,090

[1] Amortization of intangible assets included in cost of revenues and operating costs and expenses

[2] Stock-based compensation expense included in cost of revenues and operating costs and expenses