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CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' (DEFICIT) EQUITY (Parenthetical)
Dec. 31, 2020
Dec. 31, 2019
12% Warrants    
Interest rate (as a percent) 12.00% 12.00%
10% Warrants    
Interest rate (as a percent) 10.00% 10.00%
15% Warrants    
Interest rate (as a percent) 15.00% 15.00%