Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2020	Dec. 31, 2019
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	14,602,149
Common stock, shares outstanding (in shares)	14,827,410	14,602,149
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)	1,898,187	1,630,821
Preferred stock, shares outstanding (in shares)	1,875,387	1,630,421
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)	4,104,867	2,853,555
Preferred stock, shares outstanding (in shares)	4,040,429	2,837,094
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)	18,737	0
Preferred stock, shares outstanding (in shares)	18,737	0
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