Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parentheticals)

v3.19.1
Consolidated Balance Sheets (Parentheticals) - $ / shares
Mar. 31, 2019
Dec. 31, 2018
Statement Of Financial Position [Abstract]    
Ordinary shares, par value (in dollars per shares) $ 0.001 $ 0.001
Ordinary shares, authorized 490,000,000 490,000,000
Ordinary shares, issued 236,844,434 235,484,613
Ordinary shares, outstanding 215,386,265 217,650,644
Treasury stock, shares 21,458,169 17,833,969