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Inventories - Schedule of Inventories (Detail) - USD ($)
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Inventory Disclosure [Abstract]      
Finished goods $ 296,727   $ 146,640
Consigned inventory 135,635   135,635
Parts and components 28,550   48,874
Total cost 460,912   331,149
Less: excess and obsolete inventory reserves (24,000)   (24,000)
Less: consigned inventory reserves (135,635)   (51,000)
Inventories, net $ 301,277 $ 171,514 $ 256,149