Quarterly report pursuant to Section 13 or 15(d)

CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical)

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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Payments of stock issuance costs     $ 1.2 $ 1.8
At the market offering        
Payments of stock issuance costs $ 0.8 $ 0.4 1.2 $ 0.4
Private placement        
Payments of stock issuance costs     $ 0.1