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Summary of Significant Accounting Policies - Revenue by Type and Geographic Location (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disaggregation of Revenue [Line Items]    
Revenue $ 34,473 $ 7,717
U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 28,948 4,100
U.S. | System sales and rentals    
Disaggregation of Revenue [Line Items]    
Revenue 19,375 2,334
U.S. | Handpieces and other consumables    
Disaggregation of Revenue [Line Items]    
Revenue 8,893 1,699
U.S. | Service    
Disaggregation of Revenue [Line Items]    
Revenue 680 67
Outside of U.S.    
Disaggregation of Revenue [Line Items]    
Revenue 5,525 3,617
Outside of U.S. | System sales and rentals    
Disaggregation of Revenue [Line Items]    
Revenue 2,493 1,824
Outside of U.S. | Handpieces and other consumables    
Disaggregation of Revenue [Line Items]    
Revenue 2,634 1,722
Outside of U.S. | Service    
Disaggregation of Revenue [Line Items]    
Revenue $ 398 $ 71