Segment Reporting - Summary of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation of Revenue [Line Items]
Total net revenue	$ 57,384	$ 39,132	$ 165,641	$ 97,740
Total product revenue
Disaggregation of Revenue [Line Items]
Total net revenue	50,694	33,254	146,056	81,390
Products
Disaggregation of Revenue [Line Items]
Total net revenue	32,191	24,121	96,079	60,621
Consumables
Disaggregation of Revenue [Line Items]
Total net revenue	3,684	2,304	11,040	6,263
Skincare
Disaggregation of Revenue [Line Items]
Total net revenue	14,819	6,829	38,937	14,506
Service
Disaggregation of Revenue [Line Items]
Total net revenue	6,690	5,878	19,585	16,350
United States
Disaggregation of Revenue [Line Items]
Total net revenue	22,737	15,443	64,553	40,142
Japan
Disaggregation of Revenue [Line Items]
Total net revenue	19,335	11,497	53,311	27,176
Asia, excluding Japan
Disaggregation of Revenue [Line Items]
Total net revenue	3,790	3,204	9,869	8,279
Europe
Disaggregation of Revenue [Line Items]
Total net revenue	3,651	2,769	12,703	6,910
Rest of the World, other than United States, Asia and Europe
Disaggregation of Revenue [Line Items]
Total net revenue	$ 7,871	$ 6,219	$ 25,205	$ 15,233