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Leases - Operating Lease Cost (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases    
Operating lease cost $ 102,399 $ 204,798
Cost of revenue    
Leases    
Operating lease cost 46,534 93,069
General and administrative    
Leases    
Operating lease cost 46,045 92,089
Sales and marketing    
Leases    
Operating lease cost 2,604 5,209
Research and development    
Leases    
Operating lease cost $ 7,216 $ 14,431