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Inventory (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Inventory Disclosure [Abstract]        
Work in process   $ 1,950,445   $ 2,025,445
Finished goods   957,804   957,804
Inventory   2,908,249   $ 2,983,249
Write down of inventory $ 0 $ 0 $ 536,000  
Inventory write-downs     $ 686,000