Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
REVENUES	$ 87,493	$ 72,523	$ 268,201	$ 216,763
OPERATING EXPENSES:
Patent administration and licensing	40,364	34,772	119,167	108,196
Development	20,845	20,506	61,755	56,028
Selling, general and administrative	10,854	13,471	35,251	40,000
TOTAL OPERATING EXPENSES	72,063	68,749	216,173	204,224
Income from operations	15,430	3,774	52,028	12,539
INTEREST EXPENSE	(10,365)	(10,920)	(30,881)	(30,305)
OTHER INCOME, NET	3,994	7,803	13,806	23,772
Income before income taxes	9,059	657	34,953	6,006
INCOME TAX BENEFIT (PROVISION)	12,843	178	5,879	(3,007)
NET INCOME	21,902	835	40,832	2,999
Net loss attributable to noncontrolling interest	(1,882)	(1,399)	(5,319)	(4,175)
NET INCOME ATTRIBUTABLE TO INTERDIGITAL, INC.	$ 23,784	$ 2,234	$ 46,151	$ 7,174
NET INCOME PER COMMON SHARE — BASIC (in USD per share)	$ 0.77	$ 0.07	$ 1.50	$ 0.23
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC (in shares)	30,804	31,130	30,762	31,757
NET INCOME PER COMMON SHARE — DILUTED (in USD per share)	$ 0.76	$ 0.07	$ 1.49	$ 0.22
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED (in shares)	31,119	31,308	31,029	32,010
Patent licensing royalties
REVENUES	$ 85,222	$ 68,049	$ 259,404	$ 207,994
Technology solutions
REVENUES	2,271	3,724	8,797	7,794
Patent sales
REVENUES	$ 0	$ 750	$ 0	$ 975