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Consolidated Balance Sheets (Parenthetical) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Stockholders' equity: |  |
Series A Preferred stock, par value | $ 0.01 | $ 0.01
Series A Preferred stock, authorized shares | 10,000,000 | 10,000,000
Series A Preferred stock, issued shares | 0 | 0
Series A Preferred stock, outstanding shares | 0 | 0
Series B Preferred stock, par value | $ 0.01 | $ 0.01
Series B Preferred stock, authorized shares | 10,000,000 | 10,000,000
Series B Preferred stock, issued shares | 750,000 | 750,000
Series B Preferred stock, outstanding shares | 750,000 | 750,000
Series B liquidation preference | $ 930,000 | $ 922,500
Series C Preferred stock, par value | $ 0.01 | $ 0.01
Series C Preferred stock, authorized shares | 10,000,000 | 10,000,000
Series C Preferred stock, issued shares | 177,904 | 177,904
Series C Preferred stock, outstanding shares | 177,904 | 177,904
Series C liquidation preference | $ 97,847 | $ 97,847
Series D Preferred stock, par value | $ 0.01 | $ 0.01
Series D Preferred stock, authorized shares | 10,000,000 | 10,000,000
Series D Preferred stock, issued shares | 1,751,005 | 1,751,005
Series D Preferred stock, outstanding shares | 1,751,005 | 1,751,005
Series D liquidation preference | $ 5,002,470 | $ 4,961,324
Common stock, par value | $ 0.01 | $ 0.01
Common stock, authorized shares | 90,000,000 | 90,000,000
Common stock, issued shares | 68,227,171 | 67,488,153
Common stock, outstanding shares | 68,227,171 | 67,488,153

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