Consolidated Balance Sheets (Parenthetical)	Dec. 31, 2019 $ / shares shares	Dec. 31, 2018 $ / shares shares
Common stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.003
Common stock, authorized shares (in shares)	900,000,000	900,000,000
Common stock, issued shares (in shares)	14,602,149	14,598,357
Common stock, outstanding shares (in shares)	14,602,149	14,598,357
Series A Preferred Stock
Preferred stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	36,000,000	36,000,000
Preferred stock, shares issued (in shares)	1,630,821	1,566,386
Preferred stock, shares outstanding (in shares)	1,630,421	1,565,346
Preferred stock, liquidation preference per share (in usd per share) | $ / shares	$ 25.00	$ 25.00
Series A Cumulative Preferred Stock
Preferred stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	36,000,000	36,000,000
Preferred stock, shares issued (in shares)	2,853,555	1,287,169
Preferred stock, shares outstanding (in shares)	2,837,094	1,281,804
Preferred stock, liquidation preference per share (in usd per share) | $ / shares	$ 25.00	$ 25.00
Series L Preferred Stock
Preferred stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	9,000,000	9,000,000
Preferred stock, shares issued (in shares)	8,080,740	8,080,740
Preferred stock, shares outstanding (in shares)	5,387,160	8,080,740
Preferred stock, liquidation preference per share (in usd per share) | $ / shares	$ 28.37	$ 23.87