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Organization and Nature of Business; Basis of Presentation; Principles of Consolidation; Significant Accounting Policies - Narrative (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Property, Plant and Equipment [Line Items]      
Instrument warranty term     1 year
Kits and accessories warranty term     60 days
Term of lease 5 years   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   2 years
Maximum      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets     7 years
Payment terms     150 days
Lease term 5 years   5 years
Instruments      
Property, Plant and Equipment [Line Items]      
Estimated useful life of assets     5 years