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Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Line Items]        
Revenue $ 16,691 $ 8,476 $ 30,888 $ 15,668
U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 14,806 6,560 27,366 12,813
Outside of U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 1,885 1,916 3,522 2,855
System sales and rentals | U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 8,516 4,770 16,270 9,330
System sales and rentals | Outside of U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 869 973 1,610 1,244
Handpieces and other consumables | U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 5,723 1,653 10,167 3,274
Handpieces and other consumables | Outside of U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 832 890 1,578 1,493
Service | U.S.        
Disaggregation of Revenue [Line Items]        
Revenue 567 137 929 209
Service | Outside of U.S.        
Disaggregation of Revenue [Line Items]        
Revenue $ 184 $ 53 $ 334 $ 118