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CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Statement of Financial Position [Abstract]    
Accounts receivable, allowance for doubtful accounts $ 275,000 $ 275,000
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, authorized 50,000,000 50,000,000
Common stock, issued 11,820,390 11,718,246
Common stock, outstanding 11,820,390 11,718,246