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Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies - Narrative (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Property, Plant and Equipment [Line Items]      
Instrument warranty term 1 year    
Kits and accessories warranty term 60 days    
Term of lease 5 years    
Expected dividends 0.00% 0.00% 0.00%
Minimum      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets 1 year    
Payment terms 30 days    
Lease term 2 years    
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets 7 years    
Payment terms 150 days    
Lease term 5 years    
Instruments      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets 5 years