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Consolidated Balance Sheets [Parenthetical] - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Allowance for doubtful accounts receivable (in dollars) [1] $ 107,618 $ 344,411
Preferred stock, par value (in dollars per share) $ 0.001 $ 0.001
Preferred stock, shares authorized 10,000,000 10,000,000
Preferred stock, shares issued 2,045,714 2,045,714
Preferred stock, shares outstanding 0 0
Common stock, par value (in dollars per share) $ 0.001 $ 0.001
Common stock, shares authorized 110,000,000 110,000,000
Common stock, shares issued 83,031,595 82,730,134
Common stock, shares outstanding 83,031,595 82,730,134
[1] During the years ended December 31, 2017 and 2016, the Company recorded provisions for bad debt expense related to commercial customers totaling approximately $62,500 and $274,000, respectively. The Company has not historically maintained a bad debt reserve for its government customers as it has not experienced material or recurring bad debt charges and the nature and size of the contracts has not necessitated the Company’s establishment of such a bad debt reserve.