Share Options - Additional Information (Details) $ / shares in Units, $ in Thousands	1 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2015 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options granted, ordinary shares		2,718,127
Option exercise price per share | $ / shares		$ 17.02
Unrecognized compensation cost | $	$ 13,932	$ 13,932
Unrecognized compensation cost expected recognition weighted average period		3 years 1 month 24 days
2003 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted vesting period		4 years
Option granted expiration period		10 years
2013 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted vesting period		4 years
Option granted expiration period		10 years
Additional shares authorized for issuance available for grants		2,956,500
Number of shares authorized available for grant	13,198,224	13,198,224
2015 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option granted vesting period		4 years
Option granted expiration period		10 years
Options granted, ordinary shares	921,488
Option exercise price per share | $ / shares	$ 22
Ordinary shares available for grants	11,057,024	11,057,024