Consolidated Balance Sheets (Parenthetical) - $ / shares	Mar. 31, 2021	Dec. 31, 2020
Common stock, par value (in usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	900,000,000	900,000,000
Common stock, shares issued (in shares)	14,827,410	14,827,410
Common stock, shares outstanding (in shares)	14,827,410	14,827,410
Series A Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	36,000,000	36,000,000
Preferred stock, shares issued (in shares)	1,973,186	2,008,256
Preferred stock, shares outstanding (in shares)	1,972,786	2,007,856
Preferred stock, liquidation preference per share (in usd per share)	$ 25.00	$ 25.00
Series A Cumulative Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	36,000,000	36,000,000
Preferred stock, shares issued (in shares)	4,851,367	4,484,376
Preferred stock, shares outstanding (in shares)	4,715,291	4,377,762
Preferred stock, liquidation preference per share (in usd per share)	$ 25.00	$ 25.00
Series D Preferred Stock
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized (in shares)	32,000,000	32,000,000
Preferred stock, shares issued (in shares)	23,190	19,145
Preferred stock, shares outstanding (in shares)	23,190	19,145
Preferred stock, liquidation preference per share (in usd per share)	$ 25.00	$ 25.00
Series L Preferred Stock
Preferred stock, par value (in usd per share)	$ 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	5,387,160
Preferred stock, shares outstanding (in shares)	8,080,740	5,387,160
Preferred stock, liquidation preference per share (in usd per share)	$ 28.37	$ 28.37