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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY    
Issuance of shares of Common Stock upon exercise of stock options and restricted stock units 389,512 772,538
Issuance of shares of Common Stock for services rendered 1,357 1,957