Annual report pursuant to Section 13 and 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.20.4
Consolidated Balance Sheets (Parenthetical) - $ / shares
Dec. 31, 2020
Dec. 31, 2019
Statement Of Financial Position [Abstract]    
Ordinary shares, par value (in dollars per share) $ 0.001 $ 0.001
Ordinary shares, authorized 490,000,000 490,000,000
Ordinary shares, issued 315,636,032 237,533,270
Ordinary shares, outstanding 315,636,032 213,082,411
Ordinary shares, treasury stock 0 24,450,859