Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
REVENUES	$ 76,210	$ 68,631
OPERATING EXPENSES:
Patent administration and licensing	40,108	36,071
Development	18,818	18,495
Selling, general and administrative	12,603	14,215
TOTAL OPERATING EXPENSES	71,529	68,781
Income (loss) from operations	4,681	(150)
INTEREST EXPENSE	(10,545)	(9,478)
OTHER INCOME (EXPENSE), NET	6,023	3,615
Income (loss) before income taxes	159	(6,013)
INCOME TAX BENEFIT (PROVISION)	(1,820)	1,799
NET INCOME (LOSS)	(1,661)	(4,214)
Net loss attributable to noncontrolling interest	(1,777)	(1,411)
NET INCOME (LOSS) ATTRIBUTABLE TO INTERDIGITAL, INC.	$ 116	$ (2,803)
NET INCOME (LOSS) PER COMMON SHARE — BASIC (in USD per share)	$ 0	$ (0.09)
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC (in shares)	30,722	32,611
NET INCOME (LOSS) PER COMMON SHARE — DILUTED (in USD per share)	$ 0	$ (0.09)
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED (in shares)	30,920	32,611
Patent licensing royalties
REVENUES	$ 72,998	$ 66,378
Technology solutions
REVENUES	3,212	2,028
Patent sales
REVENUES	$ 0	$ 225