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Significant Accounting Policies - Additional Information (Details)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Segment
Dec. 31, 2020
USD ($)
Customer
Dec. 31, 2019
USD ($)
Customer
Jan. 01, 2020
USD ($)
Jan. 01, 2019
USD ($)
Deferred revenue       $ 3.3 $ 2.8
Deferred revenue, recognized   $ 2.0 $ 1.9    
Remaining service period to recognize deferred revenue, description   2024      
Capitalized contract cost, net   $ 0.2 0.4    
Laser revenue   $ 0.6 $ 0.7    
Tax benefit likely of being realized upon ultimate settlement description   measure the tax benefit as the largest amount that is more than 50% likely of being realized upon ultimate settlement.      
Number of operating segments | Segment 1        
Customer Concentration Risk | Revenue Benchmark          
Number of individual customers representing greater than 10% of bench mark | Customer   4 3    
Customer Concentration Risk | Revenue Benchmark | Four And Three Individual Customers          
Concentration risk, percentage   10.00%      
Customer Concentration Risk | Revenue Benchmark | One And Three Individual Customers          
Concentration risk, percentage     10.00%    
Customer Concentration Risk | Accounts Receivable          
Number of individual customers representing greater than 10% of bench mark | Customer   1 3    
Customer Concentration Risk | Accounts Receivable | Four And Three Individual Customers          
Concentration risk, percentage     10.00%    
Customer Concentration Risk | Accounts Receivable | One And Three Individual Customers          
Concentration risk, percentage   10.00%      
Shipping and Handling          
Shipping and handling costs   $ 0.1 $ 0.5    
Advertising expense   $ 0.0 $ 0.1    
Minimum [Member]          
Regular warranty service contracts term 12 months 12 months      
Maximum [Member]          
Extended warranty service contracts term 60 months 60 months      
Capitalized contract cost amortization period 1 year 1 year