Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Dec. 31, 2021 USD ($) segment supplier country reporting_unit	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Number of countries in which entity operates | country	42
Training on use of system term (in days)	180 days
Accrual for loyalty program	$ 10,825,000	$ 11,237,000	$ 14,222,000
Total capitalized costs	$ 4,200,000	3,400,000
Estimated economic life of demonstration units	2 years
Demonstration inventories included in finished goods	$ 3,700,000	3,600,000
Depreciation expense	1,300,000	1,400,000	1,500,000
Capitalized computing accumulated amortization	0
Capitalized computing amortization expense	0
Capitalized computing impairment loss	$ 182,000	805,000	0
Number of operating segments | segment	1
Number of reporting units | reporting_unit	1
Goodwill impairment	$ 0
Warranty term, direct sales	12
Warranty term, distributor sales	14 months
Advertising expense	$ 2,100,000	1,200,000	$ 2,800,000
Foreign currency transaction gains	$ 1,800,000	$ 0
Restricted Stock Units and Performance Share Units
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Shares granted calculation, grant period (in days)	50
Other current assets and prepaid expenses
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized computing set-up costs	$ 400,000
Other long-term assets
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized computing set-up costs	$ 3,500,000
Minimum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized costs, amortization period	2 years
Maximum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Capitalized costs, amortization period	3 years
Capitalized Cloud Computing Set-up Cost | Minimum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Cloud computing arrangement expected contract renewals	3 years
Capitalized Cloud Computing Set-up Cost | Maximum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Cloud computing arrangement expected contract renewals	10 years
United States
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Percentage of assets in the United States	99.00%	98.00%
Customer Concentration Risk | Revenue Benchmark | United States
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	42.00%	41.00%	58.00%
Customer Concentration Risk | Revenue Benchmark | Non-US
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Concentration risk percentage	58.00%	59.00%	42.00%
Sales and marketing
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Amortization of capitalized contract costs	$ 1,900,000	$ 2,600,000	$ 2,900,000
Loyalty
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Accrual for loyalty program	$ 500,000	$ 300,000
Service
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Extended service contract, option one, term	1 year
Extended service contract, option two, term	2 years
Extended service contract, option three, term	3 years
Service | Minimum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Extended service contract, option one, term	1 year
Service | Maximum
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Extended service contract, option two, term	3 years
Secret and Secret Pro
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Number of major suppliers | supplier	1
Skincare
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Number of major suppliers | supplier	1
Transferred over Time
Organization, Consolidation And Presentation Of Financial Statements [Line Items]
Percent of total revenues	11.00%	15.00%	13.00%