Stockholders’ Equity (Details) - USD ($)		1 Months Ended	6 Months Ended
	Jun. 03, 2019	Jun. 30, 2020	Jun. 30, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Gross proceeds from issuance of common stock			$ 48,641,000	$ 0
June Offering
Class of Stock [Line Items]
Net proceeds from issuance of common stock		$ 48,400,000
Number of shares sold in public offering (in shares)		13,800,000
Price of shares sold in public offering (in dollars per share)		$ 3.75	$ 3.75
Gross proceeds from issuance of common stock		$ 51,800,000
Registration Statement
Class of Stock [Line Items]
Registration of equity instruments, aggregate authorized amount	$ 200,000,000.0
Sale of stock, term	3 years
Sales Agreement, Cowen And Company, LLC
Class of Stock [Line Items]
Registration of equity instruments, aggregate authorized amount	$ 50,000,000.0