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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (DEFICIT) (Parenthetical) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Reverse Asset Acquisition    
Commissions and equity issuance costs   $ 2.6
At-the-Market Issuance    
Commissions and equity issuance costs $ 1.5