Consolidated Balance Sheets (Parenthetical)	Mar. 31, 2016 $ / shares shares	Mar. 31, 2016 € / shares shares	Dec. 31, 2015 $ / shares shares	Dec. 31, 2015 € / shares shares
Statement Of Financial Position [Abstract]
Common ordinary shares, par value | $ / shares	$ 0.001		$ 0.001
Common ordinary shares, shares authorized	350,000,000	350,000,000	350,000,000	350,000,000
Common ordinary shares, shares issued	13,371,445	13,371,445	13,355,477	13,355,477
Common ordinary shares, shares outstanding	13,371,445	13,371,445	13,355,477	13,355,477
Deferred ordinary shares, par value | (per share)	$ 1.35	€ 1.00	$ 1.35	€ 1.00
Deferred ordinary shares, shares authorized	39,994	39,994	39,994	39,994
Deferred ordinary shares, shares issued	39,994	39,994	39,994	39,994
Deferred ordinary shares, shares outstanding	39,994	39,994	39,994	39,994