Consolidated Statements of Operations and Comprehensive Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement Of Income And Comprehensive Income [Abstract]
Revenue	$ 368,433	$ 271,141	$ 200,882
Cost of revenue	114,216	83,028	63,535
Gross profit	254,217	188,113	137,347
Operating expenses:
Sales and marketing	161,337	123,330	87,731
Research and development	81,647	62,512	50,024
General and administrative	87,482	74,485	46,820
Total operating expenses	330,466	260,327	184,575
Operating loss	(76,249)	(72,214)	(47,228)
Other expense, net:
Interest income	390	2,007	4,499
Interest expense	(35,949)	(24,089)	(7,478)
Gain (loss) on extinguishment of debt and capped call modification	7,181	(446)	(1,406)
Other expenses, net	(2,748)	(921)	(212)
Total other expense, net	(31,126)	(23,449)	(4,597)
Loss before income taxes	(107,375)	(95,663)	(51,825)
Benefit from (provision for) income taxes	12,579	2,267	(425)
Net loss	$ (94,796)	$ (93,396)	$ (52,250)
Net loss per share attributable to common stockholders:
Basic	$ (2.50)	$ (2.70)	$ (1.58)
Diluted	$ (2.50)	$ (2.70)	$ (1.58)
Weighted-average common shares outstanding:
Basic	37,962,793	34,581,144	33,161,656
Diluted	37,962,793	34,581,144	33,161,656
Other comprehensive income (loss):
Foreign currency translation adjustment	$ (5,712)	$ 8,557	$ (679)
Total other comprehensive income (loss)	(5,712)	8,557	(679)
Total comprehensive loss	$ (100,508)	$ (84,839)	$ (52,929)