Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Revenue	$ 58,900	$ 42,819
Cost of revenue	20,889	13,981
Gross profit	38,011	28,838
Operating expenses:
Sales and marketing	29,588	20,071
Research and development	14,172	11,485
General and administrative	15,911	10,558
Total operating expenses	59,671	42,114
Operating loss	(21,660)	(13,276)
Other income (expense), net:
Interest and investment income	1,573	1,177
Interest expense	(5,922)	(1,635)
Other expense, net	(77)	(106)
Total other income (expense), net	(4,426)	(564)
Loss before income taxes	(26,086)	(13,840)
Benefit from (provision for) income taxes	701	(294)
Net loss	$ (25,385)	$ (14,134)
Net loss per share attributable to common stockholders:
Basic	$ (0.74)	$ (0.44)
Diluted	$ (0.74)	$ (0.44)
Weighted-average common shares outstanding:
Basic	34,075,071	32,271,067
Diluted	34,075,071	32,271,067