CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 62,924	$ 45,556
Cost of revenue	27,265	19,718
Gross profit	35,659	25,838
Operating expenses:
Research and development	14,298	10,176
Sales and marketing	19,168	15,039
General and administrative	14,169	8,700
Total operating expenses	47,635	33,915
Loss from operations	(11,976)	(8,077)
Interest income	719	416
Interest expense	(316)	(1,235)
Other income (expense), net	402	(776)
Loss before income taxes	(11,171)	(9,672)
Income taxes	819	55
Net loss	$ (11,990)	$ (9,727)
Net loss per share attributable to common stockholders, basic and diluted (in USD per share)	$ (0.13)	$ (0.38)
Weighted-average shares used in computing net loss per share attributable to common stockholders, basic and diluted (in shares)	95,401	25,290