Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenue	$ 151,798	$ 114,556
Cost of revenues:
Total cost of revenues	29,578	22,377
Gross profit	122,220	92,179
Operating expenses:
Research and development	35,177	26,352
Sales and marketing	74,905	59,910
General and administrative	21,174	17,241
Total operating expenses	131,256	103,503
Loss from operations	(9,036)	(11,324)
Other expense:
Interest income	4,174	1,824
Interest expense	(5,513)	(5,174)
Other expense	(12)	(283)
Total other expense	(1,351)	(3,633)
Loss before income tax expense	(10,387)	(14,957)
Income tax expense	(713)	(491)
Net loss	$ (11,100)	$ (15,448)
Net loss per share, basic and diluted	$ (0.27)	$ (0.41)
Weighted average common shares used in computing basic and diluted net loss per share:	40,568	37,832
Subscription [Member]
Revenues:
Total revenue	$ 144,226	$ 108,602
Cost of revenues:
Total cost of revenues	21,301	15,235
Professional Services and Other [Member]
Revenues:
Total revenue	7,572	5,954
Cost of revenues:
Total cost of revenues	$ 8,277	$ 7,142