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Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies - Narrative (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 15, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Dec. 31, 2020
Mar. 31, 2021
Sep. 03, 2020
Apr. 14, 2020
Mar. 31, 2020
Dec. 31, 2019
Apr. 04, 2018
Mar. 27, 2018
Property, Plant and Equipment [Line Items]                        
Allowance for credit losses   $ (213,000) $ (141,000) $ (213,000) $ (445,000) $ (209,000)     $ (110,000) $ 0    
Impairment charges       $ 0 $ 0              
Instrument warranty term       1 year                
Kits and accessories warranty term       60 days                
Lease extension   1 year   1 year                
Lessor lease term   5 years   5 years                
Expected dividends   0.00% 0.00% 0.00%                
Unsecured obligations                        
Property, Plant and Equipment [Line Items]                        
Aggregate principal amount   $ 5,300,000   $ 5,300,000                
PPP Loan | Unsecured obligations                        
Property, Plant and Equipment [Line Items]                        
Aggregate principal amount               $ 4,800,000        
Interest rate   1.00%   1.00%     1.00%          
PPP Loan | Unsecured obligations | Subsequent event                        
Property, Plant and Equipment [Line Items]                        
Full forgiveness $ 4,800,000                      
2.50% Convertible notes due 2023 | Unsecured obligations                        
Property, Plant and Equipment [Line Items]                        
Aggregate principal amount                     $ 171,500,000 $ 150,000,000.0
Interest rate   2.50%   2.50%               2.50%
Instruments                        
Property, Plant and Equipment [Line Items]                        
Estimated useful life of assets       5 years                
Minimum                        
Property, Plant and Equipment [Line Items]                        
Estimated useful life of assets       1 year                
Lease term   2 years   2 years                
Maximum                        
Property, Plant and Equipment [Line Items]                        
Estimated useful life of assets       7 years                
Lease term   6 years   6 years