CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue	$ 18,877	$ 24,152	$ 38,234	$ 47,559
Cost of goods sold	9,556	8,325	17,199	18,095
Gross profit	9,321	15,827	21,035	29,464
Selling, general and administrative expenses	17,259	25,178	37,614	48,964
Operating loss	(7,938)	(9,351)	(16,579)	(19,500)
Other (expense) income, net	68	105	(17)	210
Change in fair value of financial instruments and other	0	3,319	100	623
Loss before provision for income taxes	(7,870)	(5,927)	(16,496)	(18,667)
Income tax (expense) benefit	0	4	0	(30)
Net loss	$ (7,870)	$ (5,923)	$ (16,496)	$ (18,697)
Net loss per common share, basic (in usd per share)	$ (0.05)	$ (0.04)	$ (0.11)	$ (0.13)
Net loss per common share, diluted (in usd per share)	$ (0.05)	$ (0.04)	$ (0.11)	$ (0.13)
Weighted-average shares used in computing net loss per share, basic (in shares)	145,168,510	139,936,443	145,079,859	139,817,622
Weighted-average shares used in computing net loss per share, diluted (in shares)	145,168,510	139,936,443	145,079,859	139,817,622