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Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 27, 2018
Property, Plant and Equipment [Line Items]      
Allowance for credit losses $ 110    
Instrument warranty term 1 year    
Kits and accessories warranty term 60 days    
Expected dividends 0.00% 0.00%  
Lessor lease term 5 years    
2.50% Convertible notes due 2023 | Unsecured obligations      
Property, Plant and Equipment [Line Items]      
Interest rate     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    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets 7 years    
Lease term 6 years