CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenue	$ 22,439	$ 20,442
Cost of goods sold	2,983	2,200
Gross profit	19,456	18,242
Operating expenses:
Sales and marketing	25,605	20,922
Research and development	3,580	2,955
General and administrative	7,139	5,940
Total operating expenses	36,324	29,817
Loss from operations	(16,868)	(11,575)
Interest and other income (expense), net:
Interest income	73	61
Interest expense	(561)	(1,064)
Other income (expense), net	(54)	336
Net loss	(17,410)	(12,242)
Other comprehensive income (loss):
Changes in foreign currency translation	0	(115)
Unrealized gain (loss) on marketable securities	(248)	21
Comprehensive loss	$ (17,658)	$ (12,336)
Net loss per share, basic (in usd per share)	$ (0.52)	$ (0.37)
Net loss per share, diluted (in usd per share)	$ (0.52)	$ (0.37)
Weighted-average number of common shares used to compute basic net loss per share (in shares)	33,792,326	32,691,578
Weighted-average number of common shares used to compute diluted net loss per share (in shares)	33,792,326	32,691,578