Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Revenue	$ 328,006	$ 257,664	$ 200,225
Cost of revenue	134,511	104,034	83,104
Gross profit	193,495	153,630	117,121
Operating expenses:
Research and development	45,190	34,172	27,120
Sales and marketing	95,592	72,001	66,570
General and administrative	49,446	40,448	29,151
Total operating expenses	190,228	146,621	122,841
Income (loss) from operations	3,267	7,009	(5,720)
Other income (expense), net:
Interest expense	(13,794)	(10,245)	(3,471)
Interest income and other	6,079	3,315	490
Total other income (expense), net	(7,715)	(6,930)	(2,981)
Income (loss) before income taxes	(4,448)	79	(8,701)
Provision for income taxes	104	300	268
Net loss	$ (4,552)	$ (221)	$ (8,969)
Net loss per share:
Basic and diluted (in USD per share)	$ (0.08)	$ 0	$ (0.16)
Shares used in computing net loss per share:
Basic and diluted (in shares)	60,371	58,076	54,946
Comprehensive Loss:
Net loss	$ (4,552)	$ (221)	$ (8,969)
Other comprehensive income (loss)	669	(93)	0
Comprehensive loss	$ (3,883)	$ (314)	$ (8,969)