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Commitments and Contingencies - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Commitments And Contingencies [Line Items]    
Royalty payments, percent of net sales 1.00%  
Monthly rental payments $ 14,000  
Future minimum operating leases 266,000  
Rent expense incurred under operating lease 42,000 $ 42,000
Contract Termination    
Commitments And Contingencies [Line Items]    
Termination payment $ 25,500