Common Stock and Preferred Stock (Converted into Common Stock) - Shelf Registration Statement (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jul. 31, 2019	May 31, 2018
Class of Stock [Line Items]
Maximum aggregate offering price of common stock, preferred stock, warrants, debt securities, and/or units				$ 40,000,000.0	$ 200,000,000.0
Maximum common stock shares authorized (in shares)					2,500,000
Maximum aggregate offering price of common stock under ATM agreement		$ 31,700,000			$ 60,000,000.0
Commission, percent of gross proceeds from sale of common stock		3.00%
Shares issued (in shares)	$ 0
Estimated offering expenses			$ 61,000
At the Market Sales Agreement, six months ended June 30, 2020
Class of Stock [Line Items]
Shares issued (in shares)		$ 2,900,000
Stock issued (in shares)		283,828
Issuance of stock (in USD per share)		$ 10.31
Proceeds from issuance of common stock		$ 2,800,000
Underwriter commissions		87,766
Estimated offering expenses		$ 23,996