CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Jun. 30, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Euro deferred shares, par value (in dollars per share)	$ 0.01	$ 0.01
Euro deferred shares, shares authorized (in shares)	4,000,000	4,000,000
Euro deferred shares, shares issued (in shares)	4,000,000	4,000,000
Common stock, par value (in dollars per share)	$ 0.0001	$ 0.0001
Common stock, shares authorized (in shares)	1,000,000,000	1,000,000,000
Common stock, shares issued (in shares)	226,391,081	224,382,791
Common stock, shares outstanding (in shares)	226,391,081	224,382,791