Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parenthetical)

v3.19.3
Consolidated Balance Sheets (Parenthetical) - $ / shares
Sep. 30, 2019
Dec. 31, 2018
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 237,208,389 235,484,613
Ordinary shares, outstanding 212,757,530 217,650,644
Ordinary shares, treasury stock 24,450,859 17,833,969