Quarterly report pursuant to Section 13 or 15(d)

Consolidated Balance Sheets (Parentheticals)

v3.10.0.1
Consolidated Balance Sheets (Parentheticals) - $ / shares
Jun. 30, 2018
Dec. 31, 2017
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 235,174,511 233,840,523
Ordinary shares, outstanding 221,378,084 228,528,562
Treasury stock, shares 13,796,427 5,311,961