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Consolidated Balance Sheets (Parenthetical) - $ / shares | Dec. 31, 2019 | Dec. 31, 2018
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Senior common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Senior common stock, shares authorized (in shares) | 950,000 | 950,000
Senior common stock, shares issued (in shares) | 806,435 | 866,259
Senior common stock, shares outstanding (in shares) | 806,435 | 866,259
Common stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Common stock, shares authorized (in shares) | 86,290,000 | 87,700,000
Common stock, shares issued (in shares) | 32,593,651 | 29,254,899
Common stock, shares outstanding (in shares) | 32,593,651 | 29,254,899
Series D Preferred Stock |  |
Redeemable preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Redeemable preferred stock, liquidation preference (in dollars per share) | $ 25 | $ 25
Redeemable preferred stock, shares authorized (in shares) | 12,760,000 | 6,000,000
Redeemable preferred stock, shares issued (in shares) | 6,296,555 | 3,509,555
Redeemable preferred stock, shares outstanding (in shares) | 6,296,555 | 3,509,555
Series A and B Preferred Stock |  |
Redeemable preferred stock, par value (in dollars per share) | $ 0.001 | $ 0.001
Redeemable preferred stock, liquidation preference (in dollars per share) | $ 25 | $ 25
Redeemable preferred stock, shares authorized (in shares) | 0 | 5,350,000
Redeemable preferred stock, shares issued (in shares) | 0 | 2,264,000
Redeemable preferred stock, shares outstanding (in shares) | 0 | 2,264,000

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