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CONSOLIDATED STATEMENTS OF CASH FLOWS(Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Convertible promissory notes    
Payments of debt issuance costs $ 240 $ 2,308
Notes payable    
Payments of debt issuance costs $ 1,502 $ 0