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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) (Unaudited) - USD ($) | Mar. 31, 2021 | Dec. 31, 2020
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Statement Of Financial Position [Abstract] |  |
Allowance for doubtful accounts receivable | $ 977,490 | $ 935,261
Preferred stock, par value | $ 0.001 | $ 0.001
Preferred stock, shares authorized | 10,000,000 | 10,000,000
Preferred stock, shares issued | 0 | 0
Preferred stock, shares outstanding | 0 | 0
Common stock, par value | $ 0.001 | $ 0.001
Common stock, shares authorized | 200,000,000 | 200,000,000
Common stock, shares issued | 18,689,807 | 18,413,419
Common stock, shares outstanding | 18,689,807 | 18,413,419

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