CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenue	$ 90,152	$ 73,387
Cost of goods sold	10,428	8,902
Gross profit	79,724	64,485
Operating expenses:
Sales and marketing	93,884	73,790
Research and development	12,441	9,459
General and administrative	25,069	19,803
Total operating expenses	131,394	103,052
Loss from operations	(51,670)	(38,567)
Interest and other income (expense), net:
Interest income	186	1,097
Interest expense	(5,365)	(6,101)
Other income (expense), net	277	(126)
Net loss	(56,572)	(43,697)
Other comprehensive income (loss):
Unrealized loss of marketable securities	(31)	(59)
Changes in foreign currency translation	(141)	119
Comprehensive loss	$ (56,744)	$ (43,637)
Net loss per share, basic (in USD per share)	$ (1.71)	$ (1.50)
Net loss per share, diluted (in USD per share)	$ (1.71)	$ (1.50)
Weighted-average number of common shares used to compute basic and diluted net loss per share, basic (in shares)	33,145,930	29,059,171
Weighted-average number of common shares used to compute basic and diluted net loss per share, diluted (in shares)	33,145,930	29,059,171