CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY AND PARENT COMPANY DEFICIT - USD ($) $ in Thousands	Ordinary Shares	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit	Parent Company Deficit	Total
Balance at Dec. 31, 2013					$ (17,035)	$ (17,035)
Increase (Decrease) in Stockholders' Equity
Contribution of net assets from Innoviva, Inc.		$ 402,787	$ 91		(402,878)
Contribution of net assets from Innoviva, Inc. (in shares)	32,260,105
Cash contribution from Innoviva, Inc.					277,541	277,541
Net transfers from parent					222,934	222,934
Employee shared-based compensation expense		26,315			17,139	43,454
Cancellation of shares distributed (in shares)	(31,285)
Repurchase of shares to satisfy tax withholding		(178)				(178)
Repurchase of shares to satisfy tax withholding (in shares)	(7,737)
Excess tax benefit of share-based compensation		282				282
Net unrealized gain (loss) on marketable securities			(173)			(173)
Net loss				$ (139,337)	$ (97,701)	(237,038)
Balance at Dec. 31, 2014		429,206	(82)	(139,337)		289,787
Balance (in shares) at Dec. 31, 2014	32,221,083
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of ordinary shares		79,017				79,017
Net proceeds from sale of ordinary shares (in shares)	5,490,013
Proceeds from ESPP purchases		3,124				3,124
Proceeds from ESPP purchases (in shares)	250,209
Employee shared-based compensation expense		54,175				54,175
Issuance of restricted shares (in shares)	71,365
Repurchase of shares to satisfy tax withholding		(756)				(756)
Repurchase of shares to satisfy tax withholding (in shares)	(51,534)
Excess tax benefit of share-based compensation		(75)				(75)
Net unrealized gain (loss) on marketable securities			12			12
Net loss				(182,219)		(182,219)
Balance at Dec. 31, 2015		564,691	(70)	(321,556)		$ 243,065
Balance (in shares) at Dec. 31, 2015	37,981,136					37,981,000
Increase (Decrease) in Stockholders' Equity
Net proceeds from sale of ordinary shares	$ 1	253,027				$ 253,028
Net proceeds from sale of ordinary shares (in shares)	11,978,261
Proceeds from ESPP purchases		3,172				3,172
Proceeds from ESPP purchases (in shares)	244,587
Employee shared-based compensation expense		41,290				41,290
Issuance of restricted shares (in shares)	2,465,713
Option exercises		4,378				4,378
Option exercises (in shares)	197,328
Repurchase of shares to satisfy tax withholding		(3,871)				(3,871)
Repurchase of shares to satisfy tax withholding (in shares)	(34,182)
Excess tax benefit of share-based compensation		21				21
Net unrealized gain (loss) on marketable securities			(183)			(183)
Net loss				(190,669)		(190,669)
Balance at Dec. 31, 2016	$ 1	$ 862,708	$ (253)	$ (512,225)		$ 350,231
Balance (in shares) at Dec. 31, 2016	52,832,843					52,833,000