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Inventory (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Inventory Disclosure [Abstract]        
Work in process $ 11,554,379 $ 11,554,379   $ 18,916,084
Finished goods 3,862,429 3,862,429   7,293,880
Inventory 15,416,808 15,416,808   $ 26,209,964
Write down of inventory, net $ 0 536,000 $ 0  
Inventory write-downs   $ 686,000