Share Capital - Additional Information (Detail) - SFr / shares	9 Months Ended
	Sep. 30, 2016	Jul. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Common stock, shares outstanding	5,307,845		5,528,079
Redeemable convertible preferred shares, outstanding	27,135,884		18,837,024
Common shares, par value	SFr 0.03	SFr 0.03	SFr 0.03
Redeemable convertible preferred stock, par value	SFr 0.03		SFr 0.03
Unvested restricted share award	97,744
Vested restricted shares in outstanding share capital	38,453,593		2,444,364
Common shares, conditional capital	38,453,593		2,444,364
Maximum [Member]
Class of Stock [Line Items]
Common shares, conditional capital		34,329,942
Restricted Shares [Member]
Class of Stock [Line Items]
Vested restricted shares in outstanding share capital	8,747
Employees Stock Options [Member]
Class of Stock [Line Items]
Exercised stock options in outstanding share capital	8,900