Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Accounts receivables, allowance for doubtful accounts	$ 711,752	$ 756,812
Stockholders' Equity
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	35,030,339	35,030,339
Common stock, shares outstanding (in shares)	35,030,339	35,030,339