Common Stock and Preferred Stock (Converted into Common Stock) - Public Equity Offering (Details) - USD ($) $ / shares in Units, $ in Thousands					9 Months Ended
	Aug. 07, 2020	Aug. 04, 2020	Jun. 12, 2020	Jun. 10, 2020	Sep. 30, 2020	Sep. 30, 2019
June 2020 Equity Issuances
Class of Stock [Line Items]
Shares issued in private placement transaction (in shares)				2,175,000
Cash fee, percent of gross proceeds				6.50%
Sale of stock, price per share (in dollars per share)				$ 11.40
Proceeds from issuance of common stock			$ 23,000	$ 25,000	$ 23,048	$ 0
August 2020 Equity Issuances
Class of Stock [Line Items]
Shares issued in private placement transaction (in shares)		5,000,000
Sale of stock, price per share (in dollars per share)		$ 18.00
Proceeds from issuance of common stock	$ 96,500				$ 96,540	$ 0
Exercisable period on additional issuance of common stock		30 days
Number of additional shares authorized (in shares)		750,000