Annual report pursuant to Section 13 and 15(d)

Statement of Stockholders' Equity (Parenthetical)

v3.20.4
Statement of Stockholders' Equity (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common stock, par value (in dollars per share) $ 0.001 $ 0.001  
Common Stock      
Common stock, par value (in dollars per share) $ 0.001 $ 0.001 $ 0.001