CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 58,086	$ 37,797	$ 151,352	$ 92,506
Cost of revenue	16,020	10,491	41,408	29,736
Gross profit	42,066	27,306	109,944	62,770
Operating expenses:
Technology and development	4,139	3,390	11,738	9,280
Sales and marketing	15,004	10,911	41,790	30,142
General and administration	8,875	5,214	25,593	13,799
Total operating expenses	28,018	19,515	79,121	53,221
Operating income	14,048	7,791	30,823	9,549
Interest income	79	83	208	475
Other income (expense), net	198	(22)	29	(132)
Total other income (expense), net	277	61	237	343
Income before income taxes	14,325	7,852	31,060	9,892
Provision for income taxes	799	1,621	2,695	2,104
Net income	$ 13,526	$ 6,231	$ 28,365	$ 7,788
Net income per share attributable to common stockholders:
Basic (in usd per share)	$ 0.27	$ 0.12	$ 0.57	$ 0.10
Diluted (in usd per share)	$ 0.24	$ 0.10	$ 0.50	$ 0.09
Weighted-average shares used to compute net income per share attributable to common stockholders:
Basic (in shares)	50,559,636	10,335,359	49,754,449	10,178,598
Diluted (in shares)	56,498,891	15,876,890	56,575,867	14,072,248