CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
CONDENSED CONSOLIDATED BALANCE SHEETS
Allowance for doubtful accounts	$ 697,702	$ 484,441
Common stock, par value	$ 0.00001	$ 0.00001
Common stock, shares authorized	220,000,000	220,000,000
Common stock, shares issued	66,476,020	60,609,102
Common stock, shares outstanding	64,690,075	60,609,102
Treasury stock, shares	1,785,945