CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue:
Royalty revenue from a related party, net of amortization for capitalized fees paid to a related party of $13,823 in the year ended December 31, 2017, 2016, and 2015, respectively	$ 214,118	$ 132,684	$ 53,064
Revenue from collaborative arrangements from a related party	3,099	885	885
Total net revenue	217,217	133,569	53,949
Operating expenses:
Research and development	1,355	1,393	2,619
General and administrative	32,258	23,188	19,750
Total operating expenses	33,613	24,581	22,369
Income from operations	183,604	108,988	31,580
Other (expense) income, net	(7,042)	2,382	1,120
Interest income	1,311	582	343
Interest expense	(43,601)	(52,416)	(51,803)
Net income (loss)	134,272	59,536	(18,760)
Net income attributable to noncontrolling interest	129	0	0
Net income (loss) attributable to Innoviva stockholders	$ 134,143	$ 59,536	$ (18,760)
Basic net income (loss) per share attributable to Innoviva stockholders	$ 1.25	$ 0.54	$ (0.16)
Diluted net income (loss) per share attributable to Innoviva stockholders	$ 1.17	$ 0.53	$ (0.16)
Shares used to compute Innoviva basic and diluted net income (loss) per share:
Shares used to compute basic net income (loss) per share	106,945	110,280	115,372
Shares used to compute diluted net income (loss) per share	119,866	123,233	115,372
Cash dividends declared per common share (in dollars per share)	$ 0.00	$ 0.00	$ 0.75