Organization and Summary of Significant Accounting Policies - Composition of Inventory (Details) - USD ($)	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Finished goods	$ 4,996,900	$ 2,668,700
Raw materials	1,482,000	3,035,000
Inventory reserve for obsolescence	(43,000)	(62,400)
Inventories, net	$ 6,435,900	$ 5,641,300