Annual report pursuant to Section 13 and 15(d)

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

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Stockholders' Equity - At-the-Market Offerings (Details) - At-the-market Offering Program - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 22, 2021
Jun. 07, 2018
Sale of Stock        
Aggregate offering price for at-the-market offering program     $ 50.0 $ 25.0
Common stock sold (in shares) 1,242,253 2,000,000    
Net proceeds from sale of the common stock, after deducting fees and other offering expenses $ 14.5 $ 15.9    
Common stock commissions paid 0.5 0.5    
Aggregate offering price for at-the-market offering program, available for issuance $ 3.9 $ 3.9