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Consolidated Balance Sheets (Parenthetical) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
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Statement of Financial Position [Abstract] |  |
Allowance for doubtful accounts receivable | $ 4,283,826 | $ 4,752,265
Preferred stock, par value (in dollars per share) | $ 0.0001 | $ 0.0001
Preferred stock, shares authorized (in shares) | 1,000,000 | 1,000,000
Preferred stock, shares Issued (in shares) | 0 | 0
Preferred stock, shares outstanding (in shares) | 0 | 0
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) | 41,197,404 | 36,590,417
Common stock, shares outstanding (in shares) | 41,197,404 | 36,590,417

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