Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity At-the-Market Offering (Details)

v3.21.1
Stockholders' Equity At-the-Market Offering (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Subsidiary, Sale of Stock [Line Items]    
Number of shares authorized to be sold under equity distribution agreement (in shares) 35,000,000  
Number of common shares issued under equity distribution agreement and outstanding as of period-end (in shares) 7,490,235  
Accumulated proceeds from issuance of common shares under equity distribution agreement $ 128.6  
At the Market Offering [Member]    
Subsidiary, Sale of Stock [Line Items]    
Number of shares of stock issued during period (in shares) 0 0
Issuance of stock, net of offering costs $ 0.0 $ 0.0