InterDigital (IDCC) 10-Q 5 Aug 21 2021 Q2 Quarterly report Financial data

Cover Page

Cover Page - shares	6 Months Ended
	Jun. 30, 2021	Aug. 03, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Document Transition Report	false
Entity File Number	1-33579
Entity Registrant Name	INTERDIGITAL, INC.
Entity Incorporation, State or Country Code	PA
Entity Tax Identification Number	82-4936666
Entity Address, Address Line One	200 Bellevue Parkway
Entity Address, Address Line Two	Suite 300
Entity Address, City or Town	Wilmington
Entity Address, State or Province	DE
Entity Address, Postal Zip Code	19809-3727
City Area Code	302
Local Phone Number	281-3600
Title of 12(b) Security	Common Stock, par value $0.01 per share
Trading Symbol	IDCC
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		30,707,146
Entity Central Index Key	0001405495
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q2
Amendment Flag	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Cash and cash equivalents	$ 410,144	$ 473,474
Short-term investments	425,759	453,173
Accounts receivable, less allowances of $322 and $0	12,003	16,008
Prepaid and other current assets	74,797	59,894
Total current assets	922,703	1,002,549
PROPERTY AND EQUIPMENT, NET	14,588	16,630
PATENTS, NET	381,564	418,343
DEFERRED TAX ASSETS	82,826	80,380
OTHER NON-CURRENT ASSETS, NET	95,402	98,373
Total non-current assets	574,380	613,726
TOTAL ASSETS	1,497,083	1,616,275
CURRENT LIABILITIES:
Accounts payable	7,043	10,979
Accrued compensation and related expenses	30,310	32,413
Deferred revenue	158,899	219,935
Dividends payable	10,794	10,786
Other accrued expenses	27,175	21,649
Total current liabilities	234,221	295,762
LONG-TERM DEBT	420,598	367,992
LONG-TERM DEFERRED REVENUE	82,446	108,069
OTHER LONG-TERM LIABILITIES	43,573	47,886
TOTAL LIABILITIES	780,838	819,709
COMMITMENTS AND CONTINGENCIES
SHAREHOLDERS’ EQUITY:
Preferred Stock, $0.10 par value, 14,399 shares authorized, 0 shares issued and outstanding	0	0
Common Stock, $0.01 par value, 100,000 shares authorized, 71,588 and 71,389 shares issued and 30,842 and 30,816 shares outstanding	715	714
Additional paid-in capital	745,472	738,481
Retained earnings	1,349,073	1,413,969
Accumulated other comprehensive loss	(323)	(184)
TOTAL SHAREHOLDERS’ EQUITY	2,094,937	2,152,980
Treasury stock, 40,746 and 40,573 shares of common held at cost	1,390,752	1,379,611
Total InterDigital, Inc. shareholders’ equity	704,185	773,369
Noncontrolling interest	12,060	23,197
Total equity	716,245	796,566
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 1,497,083	$ 1,616,275

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
CURRENT ASSETS:
Accounts receivable, less allowances of $322 and $0	$ 322	$ 0
SHAREHOLDERS’ EQUITY:
Preferred stock, par value (in USD per share)	$ 0.10	$ 0.10
Preferred stock, shares authorized (in shares)	14,399,000	14,399,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in USD per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	71,588,000	71,389,000
Common stock, shares outstanding (in shares)	30,842,000	30,816,000
Treasury stock, shares of common held at cost (in shares)	40,746,000	40,573,000

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
REVENUES	$ 87,735	$ 104,498	$ 170,098	$ 180,708
OPERATING EXPENSES:
Patent administration and licensing	40,970	38,695	77,544	78,803
Development	21,870	22,092	44,453	40,910
Selling, general and administrative	14,799	11,794	26,016	24,397
Restructuring activities	13,245	0	13,245	0
Total Operating expenses	90,884	72,581	161,258	144,110
(Loss) income from operations	(3,149)	31,917	8,840	36,598
INTEREST EXPENSE	(6,666)	(9,971)	(13,656)	(20,516)
OTHER INCOME, NET	3,039	3,789	3,763	9,812
(Loss) income before income taxes	(6,776)	25,735	(1,053)	25,894
INCOME TAX PROVISION	(21)	(5,144)	(1,786)	(6,964)
NET (LOSS) INCOME	(6,797)	20,591	(2,839)	18,930
Net loss attributable to noncontrolling interest	(8,415)	(1,660)	(10,028)	(3,437)
NET INCOME ATTRIBUTABLE TO INTERDIGITAL, INC.	$ 1,618	$ 22,251	$ 7,189	$ 22,367
NET INCOME PER COMMON SHARE — BASIC (in USD per share)	$ 0.05	$ 0.72	$ 0.23	$ 0.73
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — BASIC (in shares)	30,804	30,757	30,820	30,740
NET INCOME PER COMMON SHARE — DILUTED (in USD per share)	$ 0.05	$ 0.72	$ 0.23	$ 0.72
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING — DILUTED (in shares)	31,189	31,045	31,192	30,982
Patent licensing royalties
REVENUES	$ 86,205	$ 101,184	$ 166,378	$ 174,182
Technology solutions
REVENUES	$ 1,530	$ 3,314	$ 3,720	$ 6,526

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (6,797)	$ 20,591	$ (2,839)	$ 18,930
Unrealized (loss) gain on investments, net of tax	(69)	412	(139)	444
Comprehensive (loss) income	(6,866)	21,003	(2,978)	19,374
Comprehensive loss attributable to noncontrolling interest	(8,415)	(1,660)	(10,028)	(3,437)
Total comprehensive income attributable to InterDigital, Inc.	$ 1,549	$ 22,663	$ 7,050	$ 22,811

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained EarningsCumulative Effect, Period of Adoption, Adjustment	Accumulated Other Comprehensive Loss	Treasury Stock	Non-Controlling Interest
Beginning balance (in shares) at Dec. 31, 2019			71,268					40,567
Beginning balance at Dec. 31, 2019	$ 786,281		$ 712	$ 727,402	$ 1,412,779		$ (74)	$ (1,379,262)	$ 24,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	116				116
Net loss attributable to noncontrolling interest	(1,777)								(1,777)
Net change in unrealized loss on short-term investments	32						32
Dividends declared ($0.35 per share)	(10,763)			84	(10,847)
Exercise of common stock options (in shares)			27
Exercise of common stock options	778		$ 1	777
Issuance of common stock, net (in shares)			27
Issuance of common stock, net	(725)			(725)
Amortization of unearned compensation	2,003			2,003
Repurchase of common stock (in shares)								6
Repurchase of common stock	(349)							$ (349)
Ending balance (in shares) at Mar. 31, 2020			71,322					40,573
Ending balance at Mar. 31, 2020	775,596		$ 713	729,541	1,402,048		(42)	$ (1,379,611)	22,947
Beginning balance (in shares) at Dec. 31, 2019			71,268					40,567
Beginning balance at Dec. 31, 2019	786,281		$ 712	727,402	1,412,779		(74)	$ (1,379,262)	24,724
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	22,367
Net loss attributable to noncontrolling interest	(3,437)
Net change in unrealized loss on short-term investments	444
Ending balance (in shares) at Jun. 30, 2020			71,377					40,573
Ending balance at Jun. 30, 2020	790,706		$ 713	734,565	1,413,382		370	$ (1,379,611)	21,287
Beginning balance (in shares) at Mar. 31, 2020			71,322					40,573
Beginning balance at Mar. 31, 2020	775,596		$ 713	729,541	1,402,048		(42)	$ (1,379,611)	22,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	22,251				22,251
Net loss attributable to noncontrolling interest	(1,660)								(1,660)
Net change in unrealized loss on short-term investments	412						412
Dividends declared ($0.35 per share)	(10,781)			136	(10,917)
Exercise of common stock options (in shares)			19
Exercise of common stock options	1,014			1,014
Issuance of common stock, net (in shares)			36
Issuance of common stock, net	(755)			(755)
Amortization of unearned compensation	4,629			4,629
Ending balance (in shares) at Jun. 30, 2020			71,377					40,573
Ending balance at Jun. 30, 2020	790,706		$ 713	734,565	1,413,382		370	$ (1,379,611)	21,287
Beginning balance (in shares) at Dec. 31, 2020			71,389					40,573
Beginning balance at Dec. 31, 2020	796,566	$ (50,184)	$ 714	738,481	1,413,969	$ (50,184)	(184)	$ (1,379,611)	23,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	5,571				5,571
Net loss attributable to noncontrolling interest	(1,613)								(1,613)
Noncontrolling interest distribution	(1,109)								(1,109)
Net change in unrealized loss on short-term investments	(70)						(70)
Dividends declared ($0.35 per share)	(10,766)			210	(10,976)
Exercise of common stock options (in shares)			32
Exercise of common stock options	737		$ 0	737
Issuance of common stock, net (in shares)			55
Issuance of common stock, net	(2,962)			(2,962)
Amortization of unearned compensation	2,153			2,153
Repurchase of common stock (in shares)								91
Repurchase of common stock	(5,750)							$ (5,750)
Ending balance (in shares) at Mar. 31, 2021			71,476					40,664
Ending balance at Mar. 31, 2021	732,573		$ 714	738,619	1,358,380		(254)	$ (1,385,361)	20,475
Beginning balance (in shares) at Dec. 31, 2020			71,389					40,573
Beginning balance at Dec. 31, 2020	796,566	$ (50,184)	$ 714	738,481	1,413,969	$ (50,184)	(184)	$ (1,379,611)	23,197
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	7,189
Net loss attributable to noncontrolling interest	(10,028)
Net change in unrealized loss on short-term investments	(139)
Ending balance (in shares) at Jun. 30, 2021			71,588					40,746
Ending balance at Jun. 30, 2021	716,245		$ 715	745,472	1,349,073		(323)	$ (1,390,752)	12,060
Beginning balance (in shares) at Mar. 31, 2021			71,476					40,664
Beginning balance at Mar. 31, 2021	732,573		$ 714	738,619	1,358,380		(254)	$ (1,385,361)	20,475
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income attributable to InterDigital, Inc.	1,618				1,618
Net loss attributable to noncontrolling interest	(8,415)								(8,415)
Net change in unrealized loss on short-term investments	(69)						(69)
Dividends declared ($0.35 per share)	(10,767)			158	(10,925)
Exercise of common stock options (in shares)			71
Exercise of common stock options	3,632		$ 1	3,631
Issuance of common stock, net (in shares)			41
Issuance of common stock, net	(711)			(711)
Amortization of unearned compensation	3,775			3,775
Repurchase of common stock (in shares)								82
Repurchase of common stock	(5,391)							$ (5,391)
Ending balance (in shares) at Jun. 30, 2021			71,588					40,746
Ending balance at Jun. 30, 2021	$ 716,245		$ 715	$ 745,472	$ 1,349,073		$ (323)	$ (1,390,752)	$ 12,060

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Shareholders' Equity (Parenthetical) - $ / shares	3 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020
Statement of Stockholders' Equity [Abstract]
Dividends declared (in USD per share)	$ 0.35	$ 0.35	$ 0.35	$ 0.35
Accounting Standards Update [Extensible List]		Accounting Standards Update 2020-06

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (2,839)	$ 18,930
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	39,550	40,367
Non-cash interest expense, net	3,861	8,649
Non-cash change in fair-value	(949)	(5,501)
Change in deferred revenue	(86,659)	(22,683)
Deferred income taxes	(2,409)	(6,920)
Share-based compensation	5,928	6,631
Patent impairment	11,000	0
Other	0	259
(Increase) decrease in assets:
Receivables	4,006	8,892
Deferred charges and other assets	(6,384)	(1,470)
Increase (decrease) in liabilities:
Accounts payable	(375)	(3,575)
Accrued compensation and other expenses	(1,831)	(709)
Net cash provided by (used in) operating activities	(37,101)	42,870
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of short-term investments	(327,426)	(120,977)
Sales of short-term investments	354,165	132,363
Purchases of property and equipment	(937)	(3,771)
Capitalized patent costs	(20,228)	(13,849)
Long-term investments	(1,091)	0
Net cash provided by (used in) investing activities	4,483	(6,234)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from exercise of stock options	4,369	1,792
Payments on long-term debt	0	(94,909)
Repurchase of common stock	(11,141)	(349)
Non-controlling interest distribution	(1,109)	0
Taxes withheld upon restricted stock unit vestings	(3,673)	(1,480)
Dividends paid	(21,525)	(21,509)
Net cash used in financing activities	(33,079)	(116,455)
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(65,697)	(79,819)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, BEGINNING OF PERIOD	477,663	757,098
CASH, CASH EQUIVALENTS AND RESTRICTED CASH, END OF PERIOD	$ 411,966	$ 677,279

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
BASIS OF PRESENTATION	BASIS OF PRESENTATION In the opinion of management, the accompanying unaudited, condensed consolidated financial statements contain all adjustments, consisting only of normal recurring adjustments, necessary for a fair statement of the financial position of InterDigital, Inc. (individually and/or collectively with its subsidiaries referred to as “InterDigital,” the “Company,” “we,” “us” or “our,” unless otherwise indicated) as of June 30, 2021, the results of our operations for the three and six months ended June 30, 2021 and 2020 and our cash flows for the six months ended June 30, 2021 and 2020. The accompanying unaudited, condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, accordingly, do not include all of the detailed schedules, information and notes necessary to state fairly the financial condition, results of operations and cash flows in conformity with United States generally accepted accounting principles (“GAAP”). The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP for year-end financial statements. Therefore, these financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (our “2020 Form 10-K”) as filed with the Securities and Exchange Commission (“SEC”) on February 18, 2021. Definitions of capitalized terms not defined herein appear within our 2020 Form 10-K. The results of operations for interim periods are not necessarily indicative of the results to be expected for the entire year. We have one reportable segment. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates. InterDigital has analyzed the impact of the ongoing Coronavirus pandemic (“COVID-19”) on its financial statements as of June 30, 2021. InterDigital has determined that the changes to its significant judgments and estimates as a result of COVID-19 did not have a material impact on its financial statements. The potential impact of COVID-19 will continue to be analyzed going forward. Change in Accounting Policies There have been no material changes or updates to our existing accounting policies from the disclosures included in our 2020 Form 10-K, except as indicated below in " New Accounting Guidance ". Prior Periods' Financial Statement Revision In connection with the preparation of the condensed consolidated financial statements as of and for the three months ended June 30, 2021, it was identified that we incorrectly classified certain tax receivables, representing approximately 1.5% of December 31, 2020 total assets, as other current assets instead of non-current in the presentation of our consolidated balance sheet. We assessed the materiality of this misstatement on prior periods’ financial statements in accordance with ASC Topic 250, Accounting Changes and Error Corrections, (“ASC 250”) and concluded it was not material to any prior annual or interim periods. In accordance with ASC 250, we have corrected our presentation of other current and non-current assets for prior periods presented in this Form 10-Q by revising the condensed consolidated financial statements and other consolidated financial information included herein. We will continue to present the prior periods on this revised basis to the extent we present such prior periods in future filings. Refer to Note 10, " Other Assets " for additional information on the revision. Reclassifications Certain reclassifications have been made to prior year amounts to conform to the current year presentation. Supplemental Cash Flow Information The following table presents additional supplemental cash flow information for the six months ended June 30, 2021 and 2020 (in thousands): FOR THE SIX MONTHS ENDED JUNE 30, SUPPLEMENTAL CASH FLOW INFORMATION: 2021 2020 Interest paid $ 4,000 $ 4,712 Income taxes paid, including foreign withholding taxes 4,793 13,788 Non-cash investing and financing activities: Dividend payable 10,794 10,781 Non-cash acquisition of patents — 33,300 Accrued capitalized patent costs and property and equipment 3,561 (742) New Accounting Guidance Accounting Standards Update: Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes" ("ASU 2019-12"). The amendments in this ASU are intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020 with early adoption allowed. We adopted this guidance as of January 1, 2021 and the adoption did not have a material impact on our consolidated financial statements. Accounting Standards Update: Simplifying the Accounting for Convertible Instruments In August 2020, the FASB issued ASU No. 2020-06, “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity” (“ASU 2020-06”). The amendments in this ASU are intended to simplify accounting for convertible debt instruments and convertible preferred stock by removing certain accounting models which separate the embedded conversion features from the host contract. ASU 2020-06 also amends certain guidance in ASC 260 on the computation of earnings per share for convertible instruments and contracts on an entity’s own equity. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years, and early adoption is permitted for fiscal years beginning after December 15, 2020. This update permits the use of either the modified retrospective or fully retrospective methods of transition. We elected to early adopt this standard on a modified retrospective approach as of January 1, 2021. This adoption increased long-term debt by $50.2 million at January 1, 2021, which was comprised of $51.6 million of unamortized interest discount and was partially offset by a net increase of $1.4 million equity component of deferred financing costs. This was due to the standard no longer requiring bifurcation of the embedded conversion feature from the host contract on the 2024 Notes, as defined in Note 7, " Obligations ." This adoption also reduced non-cash interest expense starting in 2021 due to the removal of the accretion of the debt discount on the 2024 Notes. Lastly, the adoption requires the use of the if-converted method of calculating diluted earnings per share rather than the treasury stock method for convertible instruments and requires the inclusion of the potential effect of shares settled in cash or shares in the diluted earnings per share calculation. Due to the reduction in non-cash interest expense, this adoption increased both basic and diluted earnings per share by $0.09 in the three months ended June 30, 2021 and $0.17 in the six months ended June 30, 2021. Accounting Standards Update: Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity Classified Written Call Options In May 2021, the FASB issued ASU No. 2021-04. The amendments in this ASU are intended to clarify and reduce diversity in an issuer’s accounting for modifications or exchanges of freestanding equity-classified written call options, including warrants, that remain equity classified after modification or exchange. ASU 2021-04 is effective for fiscal years beginning after December 15, 2021, with early adoption allowed. The Company is currently evaluating the anticipated impact of the adoption of ASU 2021-04 on its consolidated financial statements.

Revenue

Revenue	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
REVENUE	REVENUE Disaggregated Revenue The following table presents the disaggregation of our revenue for the three and six months ended June 30, 2021 and 2020 (in thousands): Three months ended June 30, 2021 2020 Increase/(Decrease) Variable patent royalty revenue $ 7,323 $ 4,597 $ 2,726 59 % Fixed-fee royalty revenue 69,296 77,338 (8,042) (10) % Current patent royalties a 76,619 81,935 (5,316) (6) % Non-current patent royalties b 9,586 19,249 (9,663) (50) % Total patent royalties 86,205 101,184 (14,979) (15) % Current technology solutions revenue a 1,530 3,314 (1,784) (54) % Total revenue $ 87,735 $ 104,498 $ (16,763) (16) % Six months ended June 30, 2021 2020 Increase/(Decrease) Variable patent royalty revenue $ 14,419 $ 10,543 $ 3,876 37 % Fixed-fee royalty revenue 138,592 143,685 (5,093) (4) % Current patent royalties a 153,011 154,228 (1,217) (1) % Non-current patent royalties b 13,367 19,954 (6,587) (33) % Total patent royalties 166,378 174,182 (7,804) (4) % Current technology solutions revenue a 3,720 6,526 (2,806) (43) % Total revenue $ 170,098 $ 180,708 $ (10,610) (6) % a. Recurring revenues are comprised of current patent royalties, inclusive of Dynamic Fixed-Fee Agreement royalties, and current technology solutions revenue. b. Non-recurring revenues are comprised of non-current patent royalties, which include past patent royalties and royalties from static agreements, as well as patent sales. During the six months ended June 30, 2021, we recognized $124.3 million of revenue that had been included in deferred revenue as of the beginning of the period. As of June 30, 2021, we had contract assets of $8.3 million and $8.8 million included within " Accounts receivable " and " Other non-current assets, net " in the condensed consolidated balance sheet, respectively. As of December 31, 2020, we had contract assets of $9.7 million and $8.9 million included within " Accounts receivable " and " Other non-current assets, net " in the condensed consolidated balance sheet, respectively. Contracted Revenue Based on contracts signed and committed as of June 30, 2021, we expect to recognize the following revenue from Dynamic Fixed-Fee Agreement payments over the term of such contracts (in thousands): Revenue Remainder 2021 $ 142,886 2022 239,307 2023 44,469 2024 89 2025 and beyond — Total Revenue $ 426,751

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2021
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES In the six months ended June 30, 2021 and 2020, the Company had an effective tax rate of (169.6)% and 26.9%, respectively. The effective tax rate in both periods was impacted by losses in certain jurisdictions where the Company presently has recorded a valuation allowance against the related tax benefit. Excluding this valuation allowance, our effective tax rate for the six months ended June 30, 2021 and 2020 would have been 104.3% and 12.5% respectively. During the six months ended June 30, 2021 and 2020, the Company recorded discrete net expense of $0.6 million and $0.3 million, respectively, primarily related to share-based compensation. The effective tax rate reported in any given year will continue to be influenced by a variety of factors, including timing differences between the recognition of book and tax revenue, the level of pre-tax income or loss, the foreign vs. domestic classification of the Company’s customers, and any discrete items that may occur.

Net Income (Loss) Per Share

Net Income (Loss) Per Share	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
NET INCOME (LOSS) PER SHARE	NET INCOME (LOSS) PER SHARE Basic Earnings Per Share ("EPS") is calculated by dividing net income or loss available to common shareholders by the weighted-average number of common shares outstanding for the period. Diluted EPS reflects the potential dilution that could occur if options or other securities with features that could result in the issuance of common stock were exercised or converted to common stock or resulting from the unvested outstanding RSUs. The following tables reconcile the numerator and the denominator of the basic and diluted net income per share computation (in thousands, except for per share data): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Net income applicable to InterDigital, Inc. $ 1,618 $ 22,251 $ 7,189 $ 22,367 Weighted-average shares outstanding: Basic 30,804 30,757 30,820 30,740 Dilutive effect of stock options, RSUs, convertible securities and warrants 385 288 372 242 Diluted 31,189 31,045 31,192 30,982 Earnings per share: Basic $ 0.05 $ 0.72 $ 0.23 $ 0.73 Dilutive effect of stock options, RSUs, convertible securities and warrants — — — (0.01) Diluted $ 0.05 $ 0.72 $ 0.23 $ 0.72 Shares of common stock issuable upon the exercise or conversion of certain securities have been excluded from our computation of EPS because the strike price or conversion rate, as applicable, of such securities was greater than the average market price of our common stock and, as a result, the effect of such exercise or conversion would have been anti-dilutive. Set forth below are the securities and the weighted average number of shares of common stock underlying such securities that were excluded from our computation of EPS for the periods presented (in thousands): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Restricted stock units and stock options 30 218 205 219 Convertible securities (a) — 4,921 — 5,597 Warrants 4,921 6,273 4,921 7,620 Total 4,951 11,412 5,126 13,436 ______________________________ (a) As of December 31, 2020, we made the irrevocable election to settle all conversions of the 2024 Notes through combination settlements of cash and shares of our common stock, with a specified dollar amount of $1,000 per $1,000 principal amount of 2024 Notes and any remaining amounts in shares of our common stock. Convertible Notes and Warrants Refer to Note 7, " Obligations ," for information about the Company's convertible notes and warrants and related conversion and strike prices. During periods in which the average market price of the Company's common stock is above the applicable conversion price of the Company's convertible notes, or above the strike price of the Company's outstanding warrants, the impact of conversion or exercise, as applicable, would be dilutive and such dilutive effect is reflected in diluted EPS. As a result, in periods where the average market price of the Company's common stock is above the conversion price or strike price, as applicable, under the if-converted method, the Company calculates the number of shares issuable under the terms of the convertible notes and the warrants based on the average market price of the stock during the period, and includes that number in the total diluted shares outstanding for the period.

Litigation and Legal Proceeding

Litigation and Legal Proceedings	6 Months Ended
	Jun. 30, 2021
Litigation Settlement [Abstract]
LITIGATION AND LEGAL PROCEEDINGS	LITIGATION AND LEGAL PROCEEDINGS COURT PROCEEDINGS Lenovo UK Proceeding On August 27, 2019, the Company and certain of its subsidiaries filed a claim in the UK High Court against Lenovo Group Limited and certain of its subsidiaries. The claim, as amended, alleges infringement of five of the Company's patents relating to 3G and/or 4G/LTE standards: European Patent (U.K.) Nos. 2,363,008; 2,421,318; 2,485,558; 2,557,714; and 3,355,537. The UK High Court held case management conferences on October 6, 2020 and December 16, 2020, a disclosure hearing on January 19, 2021 and pre-trial review hearings for the first trial on January 28, 2021 and February 8, 2021. At those hearings, the UK High Court entered a schedule for the technical and non-technical FRAND proceedings. Two technical trials were scheduled for March 2021 and June 2021 and the non-technical FRAND trial is scheduled in January 2022. There are three additional technical trials scheduled for the remaining patents following the FRAND trial. The first and second technical trials were completed, and on July 29, 2021, the UK High Court issued its decision regarding the first technical trial finding European Patent (UK) No. 2 485 558 valid, infringed, and essential to Release 8 of LTE. The Company is awaiting the court’s decision regarding the merits of the second technical trial. District of Delaware Patent Proceeding On August 28, 2019, the Company and certain of its subsidiaries filed a complaint in the United States District Court for the District of Delaware (the "Delaware District Court") against Lenovo Holding Company, Inc. and certain of its subsidiaries alleging that Lenovo infringes eight of InterDigital's U.S. patents—U.S. Patent Nos. 8,085,665; 8,199,726; 8,427,954; 8,619,747; 8,675,612; 8,797,873; 9,203,580; and 9,456,449—by making, using, offering for sale, and/or selling Lenovo wireless devices with 3G and/or 4G LTE capabilities. As relief, InterDigital is seeking: (a) a declaration that InterDigital is not in breach of its relevant FRAND commitments with respect to Lenovo; (b) to the extent Lenovo does not agree to negotiate a worldwide patent license, does not agree to enter into binding international arbitration to set the terms of a FRAND license, and does not agree to be bound by the FRAND terms to be set by the UK High Court in the separately filed UK proceedings described above, an injunction prohibiting Lenovo from continued infringement; (c) damages, including enhanced damages for willful infringement and supplemental damages; and (d) attorneys’ fees and costs. On September 16, 2020, the Delaware District Court entered a schedule for the case, setting a patent jury trial for December 5, 2022. On March 8, 2021, the Delaware District Court held a claim construction hearing, and the court issued its order on May 10, 2021 construing various disputed terms. On March 24, 2021, the Delaware District Court consolidated the antitrust proceeding discussed below with this patent proceeding. District of Delaware Antitrust Proceeding On April 9, 2020, Lenovo (United States) Inc. and Motorola Mobility LLC filed a complaint in the Delaware District Court against the Company and certain of its subsidiaries. The complaint alleges that the Company defendants have violated Sections 1 and 2 of the Sherman Act in connection with, among other things, their licensing of 3G and 4G standards essential patents ("SEPs"). The complaint further alleges that the Company defendants have violated their commitment to the ETSI with respect to the licensing of 3G and 4G SEPs on FRAND terms and conditions. The complaint seeks, among other things (i) rulings that the Company defendants have violated Sections 1 and 2 of the Sherman Act and are liable for breach of their ETSI FRAND commitments, (ii) a judgment that the plaintiffs are entitled to a license with respect to the Company's 3G and 4G SEPs on FRAND terms and conditions, and (iii) injunctions against any demand for allegedly excessive royalties or enforcement of the Company defendants' 3G and 4G U.S. SEPs against the plaintiffs or their customers via patent infringement proceedings. On June 22, 2020, the Company filed a motion to dismiss Lenovo's Sherman Act claims with prejudice, and to dismiss Lenovo's breach of contract claim with leave to re-file as a counterclaim in the Company's legal proceeding against Lenovo in the Delaware District Court discussed above. Oral argument on the Company's motion to dismiss was held on October 27, 2020. On March 24, 2021, the Delaware District Court ruled on the Company’s motion to dismiss. The Delaware District Court dismissed the Sherman Act Section 1 claim without prejudice, denied the motion to dismiss the Sherman Act Section 2 claim, and consolidated the Section 2 and breach of contract claims with Company’s patent proceeding against Lenovo in the Delaware District Court discussed above. China Proceeding On April 10, 2020, Lenovo (Beijing) Ltd. and certain of its affiliates filed a complaint against the Company and certain of its subsidiaries in the Beijing Intellectual Property Court (Beijing IP Court) seeking a determination of the FRAND royalty rates payable for the Company's Chinese 3G, 4G and 5G SEPs. On February 20, 2021, the Company filed an application challenging the jurisdiction of the Beijing IP Court to take up Lenovo’s complaint. The jurisdictional challenge remains pending. Xiaomi As a result of the license agreement between the Company and a subsidiary of Xiaomi Corporation ("Xiaomi"), the parties have ceased all activity in each of the ongoing disputes, described below, other than to seek temporary stays in each pending proceeding. At the end of each stay period, the parties will take all action required to withdraw and/or terminate all legal proceedings between the parties. China Proceeding On August 5, 2020, the Company was informed in writing by Xiaomi that, on June 3, 2020, Xiaomi Communication Technology Co., Ltd. and certain of its affiliates filed a complaint against the Company and one of its subsidiaries in the Wuhan Intermediate People's Court (the "Wuhan Court") seeking for the Wuhan Court to determine a global FRAND rate for a license to the Company's 3G and/or 4G/LTE SEPs. The Company was informed on September 25, 2020 that the Wuhan Court held an ex parte hearing on or about September 23, 2020 and issued an order that, among other things, enjoins the Company from seeking a preliminary and permanent injunction against Xiaomi and certain of its subsidiaries for infringement of certain of the Company's patents related to 3G and/or 4G/LTE standards in the Company's case in the Delhi High Court discussed below, or elsewhere. The Wuhan Court ordered a fine of up to one million yuan per day if the Company were to violate the order. The Company maintains that it has not yet been properly served with Xiaomi's complaint or the Wuhan Court's anti-suit injunction order. On October 13, 2020, the Company filed an application challenging the jurisdiction of the Wuhan Court to take up Xiaomi’s complaint. On March 12, 2021, the Company’s Chinese counsel was orally informed by the Court that the Company’s application challenging jurisdiction of the Wuhan Court had been rejected. Although the Wuhan Court did not issue a written decision, the Company challenged the Court’s rejection at the IP Tribunal of the Supreme People’s Court of the People’s Republic of China (“SPC”). The Company was informed by the Wuhan Court that the Hubei High Court purportedly received a letter response from the SPC on May 17, 2021 regarding our application and forwarded it to the Wuhan Court. The Wuhan Court has interpreted the letter as a denial of our application challenging jurisdiction. The Company requested a copy of the letter but that request was denied. On September 30, 2020, the Company filed a preliminary conditional response seeking reconsideration of the Wuhan Court's anti-suit injunction. In a decision dated December 4, 2020, the Wuhan Court dismissed the Company’s reconsideration petition. The Company challenged that decision at the SPC, but that challenge was denied. The Wuhan Court held two evidentiary hearings in April and June 2021. On July 29, 2021, the Wuhan Court held the first of multiple substantive hearings during which the parties presented their respective claims, defenses and evidence. India Proceeding On July 29, 2020, the Company and certain of its subsidiaries filed two patent infringement actions in the Delhi High Court in New Delhi, India (the "Delhi High Court") against Xiaomi and certain of its subsidiaries. The first complaint alleges infringement of five of the Company's patents related to 3G and/or 4G/LTE standards: Indian Patent Nos. 262910; 295912; 298719; 313036; and 320182. The second complaint alleges infringement of three of the Company's patents related to H.265/HEVC standards: Indian Patent Nos. 242248; 299448; and 308108. In these proceedings, the Company is seeking compensatory and punitive damages for Xiaomi's infringement of the asserted patents. The Company is further seeking, among other remedies, interim and permanent injunctive relief to prevent further infringement of the litigated patents in India, unless Xiaomi elects to take a license on terms determined to be FRAND by the Delhi High Court. The Company’s application for interim injunctive relief remains pending. On September 29, 2020, the Company filed an anti-anti-suit injunction application against Xiaomi in the Delhi High Court, seeking, among other things, to enjoin Xiaomi from enforcing the Wuhan Court's September 23, 2020 anti-suit injunction order described above. On October 9, 2020, the Delhi High Court granted the Company's motion and issued an ad interim injunction restraining Xiaomi from enforcing the anti-suit injunction order issued by the Wuhan Court, pending further consideration of the Company's application for an anti-anti-suit injunction at a hearing on November 25, 2020. On May 3, 2021, the interim anti-anti-suit injunction was made permanent throughout the pendency of the Indian cellular case. Furthermore, the Delhi High Court stated that, if any orders or other measures are passed by the Wuhan Court related to the anti-suit injunction that result in the Company incurring a monetary penalty, then Xiaomi must deposit a corresponding, equal amount with the Delhi High Court for the Company's benefit within one week. On June 4, 2021, Xiaomi filed responses to the two complaints (cellular and H.265/HEVC), which included counterclaims seeking invalidation of the patents in the respective suits. The Company filed replies in support of the two complaints and in response to the counterclaims on July 5, 2021. German Proceeding On October 30, 2020, the Company filed an anti-anti-suit injunction application against Xiaomi in the Munich District Court, seeking to enjoin Xiaomi from continuing to pursue the Wuhan Court's September 23, 2020 anti-suit injunction order described above with respect to Germany. On November 11, 2020, the Munich District Court granted the Company's motion and issued an ex parte injunction restraining Xiaomi from enforcing the anti-suit injunction. The Company filed penalty requests for non-compliance with said court order, which were granted, and which Xiaomi has appealed. Xiaomi opposed the injunction and requested a stay of enforcement, and an oral hearing was held on January 28, 2021. At the hearing, the Munich District Court dismissed the request for stay of enforcement. On February 25, 2021 the Munich District Court confirmed its earlier ex parte anti-anti-suit injunction against Xiaomi. Xiaomi appealed the decision to the Higher Regional Court Munich, which is currently pending. On April 27, 2021, the Company was informed that the Munich Regional Court commenced service of three patent infringement actions filed in Germany against Xiaomi and certain of its subsidiaries by a subsidiary of the Company. The complaints involve infringement of the Company's German patents related to 3G and 4G cellular handsets (Patent Nos. EP 2,421,318; EP 2,485,558; and EP 3,355,537). The Company sought injunctive relief to prevent further infringement of the asserted patents in Germany. OTHER We are party to certain other disputes and legal actions in the ordinary course of business, including legal proceedings with licensees regarding the terms of their agreements and the negotiation thereof. We do not currently believe that these matters, even if adversely adjudicated or settled, would have a material adverse effect on our financial condition, results of operations or cash flows. None of the preceding matters have met the requirements for accrual or disclosure of a potential range as of June 30, 2021.

Cash, Concentration of Credit R

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
CASH, CONCENTRATION OF CREDIT RISK AND FAIR VALUE OF FINANCIAL INSTRUMENTS	CASH, CONCENTRATION OF CREDIT RISK AND FAIR VALUE OF FINANCIAL INSTRUMENTS Cash, Cash Equivalents and Restricted Cash Cash, cash equivalents and restricted cash currently consists of money market and demand accounts. The following table provides a reconciliation of total cash, cash equivalents and restricted cash as of June 30, 2021, December 31, 2020 and June 30, 2020 to the captions within the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in thousands): June 30, December 31, June 30, 2021 2020 2020 Cash and cash equivalents $ 410,144 $ 473,474 $ 670,292 Restricted cash included within prepaid and other current assets 741 3,108 5,906 Restricted cash included within other non-current assets 1,081 1,081 1,081 Total cash, cash equivalents and restricted cash $ 411,966 $ 477,663 $ 677,279 Concentration of Credit Risk and Fair Value of Financial Instruments Financial instruments that potentially subject us to concentration of credit risk consist primarily of cash equivalents, short-term investments, and accounts receivable. We place our cash equivalents and short-term investments only in highly rated financial instruments and in United States government instruments. Our accounts receivable and contract assets are derived principally from patent license and technology solutions agreements. As of June 30, 2021 and December 31, 2020, six and five licensees comprised 57% and 53%, respectively, of our net accounts receivable balance. We perform ongoing credit evaluations of our licensees, who generally include large, multinational, wireless telecommunications equipment manufacturers. We believe that the book values of our financial instruments approximate their fair values. Fair Value Measurements We use various valuation techniques and assumptions when measuring the fair value of our assets and liabilities. We utilize market data or assumptions that market participants would use in pricing the asset or liability, including assumptions about risk and the risks inherent in the inputs to the valuation technique. This guidance established a hierarchy that prioritizes fair value measurements based on the types of input used for the various valuation techniques (market approach, income approach and cost approach). The levels of the hierarchy are described below: Level 1 Inputs — Level 1 includes financial instruments for which quoted market prices for identical instruments are available in active markets. Level 2 Inputs — Level 2 includes financial instruments for which there are inputs other than quoted prices included within Level 1 that are observable for the instrument such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets with insufficient volume or infrequent transactions (less active markets) or model-driven valuations in which significant inputs are observable or can be derived principally from, or corroborated by, observable market data, including market interest rate curves, referenced credit spreads and pre-payment rates. Level 3 Inputs — Level 3 includes financial instruments for which fair value is derived from valuation techniques including pricing models and discounted cash flow models in which one or more significant inputs are unobservable, including the Company’s own assumptions. The pricing models incorporate transaction details such as contractual terms, maturity and, in certain instances, timing and amount of future cash flows, as well as assumptions related to liquidity and credit valuation adjustments of marketplace participants. Our assessment of the significance of a particular input to the fair value measurement requires judgment and may affect the valuation of financial assets and financial liabilities and their placement within the fair value hierarchy. We use quoted market prices for similar assets to estimate the fair value of our Level 2 investments. Recurring Fair Value Measurements Our financial assets are generally included within short-term investments on our condensed consolidated balance sheets, unless otherwise indicated. Our financial assets and liabilities that are accounted for at fair value on a recurring basis are presented in the tables below as of June 30, 2021 and December 31, 2020 (in thousands): Fair Value as of June 30, 2021 Level 1 Level 2 Level 3 Total Assets: Money market and demand accounts (a) $ 411,966 $ — $ — $ 411,966 Commercial paper (b) — 248,573 — 248,573 U.S. government securities — 119,472 — 119,472 Corporate bonds, asset backed and other securities — 57,714 — 57,714 Total $ 411,966 $ 425,759 $ — $ 837,725 Fair Value as of December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market and demand accounts (a) $ 397,522 $ — $ — $ 397,522 Commercial paper (b) — 285,242 — 285,242 U.S. government securities — 166,223 — 166,223 Corporate bonds, asset backed and other securities — 81,849 — 81,849 Total $ 397,522 $ 533,314 $ — $ 930,836 ______________________________ (a) Primarily included within cash and cash equivalents. (b) As of June 30, 2021 and December 31, 2020, $0.0 million and $80.1 million, respectively, of commercial paper was included within cash and cash equivalents. Non-Recurring Fair Value Measurements Investments in Other Entities During the second quarter 2021, we recognized a $1.0 million gain resulting from observable price changes of one of our long-term strategic investments, which was included within “ Other Income, Net ” in the condensed consolidated statement of income. During the first quarter 2020, we recognized a $5.5 million gain resulting from observable price changes of one of our long-term strategic investments, which was included within “ Other Income, Net ” in the condensed consolidated statement of income. Lease Assets During the first quarter 2020, we recognized a $1.1 million impairment, comprised of $0.8 million of Property, Plant, and Equipment, and $0.3 million of Right of Use Asset related to the abandonment of one of our leased properties, which was included within “ Operating Expense ” in the condensed consolidated statement of income. Patents During the second quarter 2021, we recognized an $11.0 million patent impairment, resulting from our restructuring activities as described in Note 11, " Restructuring Activities ", which was included within “ Restructuring activities ” expenses in the condensed consolidated statement of income. The Patents held for sale are recorded at fair value on June 30, 2021 and are included within " Prepaid and other current assets " in the consolidated balance sheet. Fair Value of Long-Term Debt 2024 Senior Convertible Notes The principal amount, carrying value and related estimated fair value of the Company's senior convertible debt reported in the condensed consolidated balance sheets as of June 30, 2021 and December 31, 2020 was as follows (in thousands). The aggregate fair value of the principal amount of the senior convertible long-term debt is a Level 2 fair value measurement. June 30, 2021 December 31, 2020 Principal Carrying Fair Principal Carrying Fair Senior Convertible Long-Term Debt $ 400,000 $ 394,806 $ 442,520 $ 400,000 $ 343,821 $ 418,760 Technicolor Patent Acquisition Long-term Debt The carrying value and related estimated fair value of the Technicolor Patent Acquisition long-term debt reported in the condensed consolidated balance sheets as of June 30, 2021 and December 31, 2020 was as follows (in thousands). The aggregate fair value of the Technicolor Patent Acquisition long-term debt is a Level 3 fair value measurement. June 30, 2021 December 31, 2020 Carrying Fair Carrying Fair Technicolor Patent Acquisition Long-Term Debt $ 25,792 $ 33,189 $ 24,171 $ 27,016

Obligations

Obligations	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
OBLIGATIONS	OBLIGATIONS Technicolor Patent Acquisition Long-Term Debt On July 30, 2018, we completed our acquisition of the patent licensing business of Technicolor SA ("Technicolor"), a worldwide technology leader in the media and entertainment sector (the "Technicolor Patent Acquisition"). In conjunction with the Technicolor Patent Acquisition we assumed Technicolor’s rights and obligations under a joint licensing program with Sony Corporation ("Sony") relating to digital televisions and standalone computer display monitors, which commenced in 2015 and is referred to as the "Madison Arrangement." An affiliate of CPPIB Credit Investments Inc. ("CPPIB Credit"), a wholly owned subsidiary of Canada Pension Plan Investment Board, is a third-party investor in the Madison Arrangement. CPPIB Credit has made certain payments to Technicolor and Sony and has agreed to contribute cash to fund certain capital reserve obligations under the arrangement in exchange for a percentage of future revenues, specifically through September 11, 2030 in regard to the Technicolor patents. Upon our assumption of Technicolor’s rights and obligations under the Madison Arrangement, our relationship with CPPIB Credit meets the criteria in ASC 470-10-25 - Sales of Future Revenues or Various Other Measures of Income ("ASC 470"), which relates to cash received from an investor in exchange for a specified percentage or amount of revenue or other measure of income of a particular product line, business segment, trademark, patent, or contractual right for a defined period. Under this guidance, we recognized the fair value of our contingent obligation to CPPIB Credit, as of the acquisition date, as long-term debt in our condensed consolidated balance sheet. This initial fair value measurement was based on the perspective of a market participant and included significant unobservable inputs which are classified as Level 3 inputs within the fair value hierarchy. The fair value of the long-term debt as of June 30, 2021 and December 31, 2020 is disclosed within Note 6, " Cash, Concentration of Credit Risk and Fair Value of Financial Instruments. " Our repayment obligations are contingent upon future royalty revenues generated from the Madison Arrangement and there are no minimum or maximum payments under the arrangement. Under ASC 470, amounts recorded as debt are amortized under the interest method. At each reporting period, we will review the discounted expected future cash flows over the life of the obligation. The Company made an accounting policy election to utilize the catch-up method when there is a change in the estimated future cash flows, whereby we will adjust the carrying amount of the debt to the present value of the revised estimated future cash flows, discounted at the original effective interest rate, with a corresponding adjustment recognized as interest expense within “ Interest Expense ” in the condensed consolidated statements of income. The effective interest rate as of the acquisition date was approximately 14.5%. This rate represents the discount rate that equates the estimated future cash flows with the fair value of the debt as of the acquisition date, and is used to compute the amount of interest to be recognized each period based on the estimated life of the future revenue streams. During the three and six months ended June 30, 2021, we recognized $0.8 million and $1.6 million, respectively, of interest expense related to this debt, compared to $0.7 million and $1.5 million during the three and six months ended June 30, 2020, respectively. This was included within “ Interest Expense ” in the condensed consolidated statements of income. Any future payments made to CPPIB Credit, or additional proceeds received from CPPIB Credit, will decrease or increase the long-term debt balance accordingly. 2024 Senior Convertible Notes, and Related Note Hedge and Warrant Transactions On June 3, 2019 we issued $400.0 million in aggregate principal amount of 2.00% Senior Convertible Notes due 2024 (the "2024 Notes"). The net proceeds from the issuance of the 2024 Notes, after deducting the initial purchasers' transaction fees and offering expenses, were approximately $391.6 million. The 2024 Notes (i) bear interest at a rate of 2.00% per year, payable in cash on June 1 and December 1 of each year, commencing on December 1, 2019, and (ii) mature on June 1, 2024, unless earlier converted or repurchased. The effective interest rate of the 2024 Notes is 2.02%. The 2024 Notes are convertible into cash, shares of our common stock or a combination thereof, at our election, at an initial conversion rate of 12.3018 shares of our common stock per $1,000 principal amount of 2024 Notes (which is equivalent to an initial conversion price of approximately $81.29 per share), as adjusted pursuant to the terms of the indenture governing the 2024 Notes (the "Indenture"). The conversion rate of the 2024 Notes, and thus the conversion price, may be adjusted in certain circumstances, including in connection with a conversion of the 2024 Notes made following certain fundamental changes and under other circumstances set forth in the Indenture. As of December 31, 2020, we made the irrevocable election to settle all conversions of the 2024 Notes through combination settlements of cash and shares of our common stock, with a specified dollar amount of $1,000 per $1,000 principal amount of 2024 Notes and any remaining amounts in shares of our common stock. The 2024 Notes are senior unsecured obligations of the Company and rank equally in right of payment with any of our current and any future senior unsecured indebtedness. The 2024 Notes are effectively subordinated to all of our future secured indebtedness to the extent of the value of the related collateral, and the 2024 Notes are structurally subordinated to indebtedness and other liabilities, including trade payables, of our subsidiaries. On May 29 and May 31, 2019, in connection with the offering of the 2024 Notes, we entered into convertible note hedge transactions (collectively, the "2024 Note Hedge Transactions") that cover, subject to customary anti-dilution adjustments, approximately 4.9 million shares of common stock, in the aggregate, at a strike price that initially corresponds to the initial conversion price of the 2024 Notes, subject to adjustment, and are exercisable upon any conversion of the 2024 Notes. On May 29 and May 31, 2019, we also entered into privately negotiated warrant transactions (collectively, the "2024 Warrant Transactions" and, together with the 2024 Note Hedge Transactions, the "2024 Call Spread Transactions"), whereby we sold warrants to acquire, subject to customary anti-dilution adjustments, approximately 4.9 million shares of common stock at an initial strike price of approximately $109.43 per share, subject to adjustment. There have been no material changes regarding the 2024 Notes and 2024 Call Spread Transactions from the disclosures included in Note 10, " Obligations " within the notes to the consolidated financial statements included in Part II, Item 8 of the 2020 Form 10-K. 2020 Senior Convertible Notes On March 11, 2015, we issued $316.0 million in aggregate principal amount of 1.50% Senior Convertible Notes due 2020 (the "2020 Notes"). The 2020 Notes bore interest at a rate of 1.50% per year and matured on March 1, 2020. On the maturity date, the outstanding balance of $94.9 million under the 2020 Notes was repaid in full. The following table reflects the carrying value of our convertible notes long-term debt as of June 30, 2021 and December 31, 2020 (in thousands): June 30, 2021 December 31, 2020 Principal $ 400,000 $ 400,000 Less: Unamortized interest discount (a) — (51,567) Deferred financing costs (a) (5,194) (4,612) Net carrying amount of the 2024 Notes $ 394,806 $ 343,821 ______________________________ (a) Due to the adoption of ASU 2020-06 on January 1, 2021, the unamortized interest discount was reclassified back to the carrying value of the 2024 Notes. Refer to Note 1, " Basis of Presentation ", for further information regarding this adoption. The following table presents the amount of interest cost recognized, which is included within " Interest Expense" in our condensed consolidated statements of income, for the three and six months ended June 30, 2021 and June 30, 2020 relating to the contractual interest coupon, accretion of the debt discount, and the amortization of deferred financing costs of the 2024 Notes and 2020 Notes (in thousands): Three months ended June 30, 2021 2020 2024 Notes 2024 Notes 2020 Notes Total Contractual coupon interest $ 2,000 $ 2,000 $ — $ 2,000 Accretion of debt discount (a) — 3,255 — 3,255 Amortization of deferred financing costs 402 291 — 291 Total $ 2,402 $ 5,546 $ — $ 5,546 Six months ended June 30, 2021 2020 2024 Notes 2024 Notes 2020 Notes Total Contractual coupon interest $ 4,000 $ 4,000 $ 237 $ 4,237 Accretion of debt discount (a) — 6,477 669 7,146 Amortization of deferred financing costs 800 579 70 649 Total $ 4,800 $ 11,056 $ 976 $ 12,032 ______________________________ (a) Due to the adoption of ASU 2020-06, there is no longer accretion of the debt discount starting January 1, 2021. Refer to Note 1, " Basis of Presentation ", for further information regarding this adoption. Technicolor Contingent Consideration As part of the Technicolor Patent Acquisition, we entered into a revenue-sharing arrangement with Technicolor that created a contingent consideration liability. Under the revenue-sharing arrangement, Technicolor receives 42.5% of future cash receipts from new licensing efforts from the Madison Arrangement only, subject to certain conditions and hurdles. As of June 30, 2021, the contingent consideration liability from the revenue-sharing arrangement was deemed not probable and is therefore not reflected within the consolidated financial statements.

Variable Interest Entities

Variable Interest Entities	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
VARIABLE INTEREST ENTITIES	VARIABLE INTEREST ENTITIESAs further discussed below, we are the primary beneficiary of three variable interest entities. As of June 30, 2021, the combined book values of the assets and liabilities associated with these variable interest entities included in our condensed consolidated balance sheet were $41.3 million and $5.7 million, respectively. Assets included $16.2 million of cash and cash equivalents, $7.5 million of accounts receivable and prepaid and other current assets, and $17.6 million of patents, net. As of December 31, 2020, the combined book values of the assets and liabilities associated with these variable interest entities included in our condensed consolidated balance sheet were $62.0 million and $5.8 million, respectively. Assets included $24.5 million of cash and cash equivalents, $2.3 million of accounts receivable and prepaid and other current assets, and $35.2 million of patents, net. Chordant On January 31, 2019, we launched the Company’s Chordant™ business as a standalone company. The spinout of the unit, which now includes an affiliate of Sony as an investor along with the Company, gives Chordant added independence and flexibility in driving into its core operator and smart city markets. Chordant is a variable interest entity and we have determined that we are the primary beneficiary for accounting purposes and consolidate Chordant. For the three and six months ended June 30, 2021, we have allocated approximately $2.2 million and $2.3 million, respectively, of Chordant's net loss to noncontrolling interests held by other parties, and for the three and six months June 30, 2020, we allocated $0.2 million and $0.5 million, respectively, of Chordant's net loss to noncontrolling interests held by other parties. During second quarter 2021, Chordant has begun the process of ceasing operations. Convida Wireless Convida Wireless was launched in 2013 and most recently renewed in 2018 to combine Sony's consumer electronics expertise with our pioneering IoT expertise to drive IoT communications and connectivity. Based on the terms of the agreement, the parties will contribute funding and resources for additional research and platform development, which we will perform. SCP IP Investment LLC, an affiliate of Stephens Inc., is a minority investor in Convida Wireless. Convida Wireless is a variable interest entity. Based on our provision of research and platform development services to Convida Wireless, we have determined that we remain the primary beneficiary for accounting purposes and will continue to consolidate Convida Wireless. For each of the three and six months ended June 30, 2021 and 2020, we have allocated approximately $6.2 million and $7.7 million, respectively, of Convida Wireless's net loss to noncontrolling interests held by other parties and for the three and six months June 30, 2020, we allocated $1.5 million and $2.9 million, respectively. During the second quarter 2021, we recognized an $11.0 million impairment on the patents within the Convida portfolio, resulting from our restructuring activities as described in Note 11, " Restructuring Activities ", which is included within “ Restructuring activities ” expenses in the condensed consolidated statement of income. The Patents held for sale are recorded at fair value on June 30, 2021 and are included within " Prepaid and other current assets " in the consolidated balance sheet. Signal Trust for Wireless Innovation During 2013, we announced the establishment of the Signal Trust for Wireless Innovation (the “Trust”), the goal of which was to monetize a patent portfolio primarily related to 3G cellular infrastructure. In response to a request from Signal Trust, in first quarter 2021 we provided our consent, as major beneficiary, to dissolve Signal Trust. The Trust has been accounted for as a variable interest entity. Based on the terms of the trust agreement, we determined that we are the primary beneficiary for accounting purposes and have included the Trust in our consolidated financial statements. Pending the dissolution of the Trust, we will continue to consolidate the Trust in our consolidated financial statements.

Other Income, Net

Other Income, Net	6 Months Ended
	Jun. 30, 2021
Other Income and Expenses [Abstract]
OTHER INCOME, NET	OTHER INCOME, NET The amounts included in " Other income, net " in the condensed consolidated statements of income for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Interest and investment income $ 446 $ 1,342 $ 999 $ 4,219 Other 2,593 2,447 2,764 5,593 Other income, net $ 3,039 $ 3,789 $ 3,763 $ 9,812 Interest and investment income decreased in both the three and six months ended June 30, 2021, due to reduced rates of return on our short-term investments. Other income remained flat in the three months ended June 30, 2021, compared to the three months ended June 30, 2020. The decrease in other income in the six months ended June 30, 2021, compared to six months ended June 30, 2020 was primarily driven by a decrease in gains resulting from observable price changes of our long-term strategic investments, which were $5.5 million during the six months ended June 30, 2020 and $1.0 million in June 30, 2021. This decrease was partially offset by a $1.9 million gain on a contract termination in first quarter 2021.

Other Assets

Other Assets	6 Months Ended
	Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
OTHER ASSETS	OTHER ASSETS The amounts included in " Prepaid and other current assets " in the consolidated balance sheet as of June 30, 2021 and December 31, 2020 were as follows (in thousands): As Reported As Revised (a) June 30, 2021 December 31, 2020 December 31, 2020 Tax receivables $ 46,214 $ 69,592 $ 45,262 Prepaid assets 7,417 10,899 10,899 Patents held for sale 6,228 — — Receivable from sale of long-term investments 3,016 — — Operating lease receivable — 817 817 Other current assets 11,922 2,916 2,916 Total Prepaid and other current assets $ 74,797 $ 84,224 $ 59,894 The amounts included in " Other non-current assets, net " in the consolidated balance sheet as of June 30, 2021 and December 31, 2020 were as follows (in thousands): As Reported As Revised (a) June 30, 2021 December 31, 2020 December 31, 2020 Tax receivables $ 27,108 $ — $ 24,330 Goodwill 22,421 22,421 22,421 Right-of-use assets 19,091 22,456 22,456 Long-term investments 14,580 15,489 15,489 Other non-current assets 12,202 13,677 13,677 Total Other non-current assets, net $ 95,402 $ 74,043 $ 98,373 _____________________________ (a) As discussed in Note 1, we revised our prior period presentation of " Prepaid and other current assets " and " Other non-current assets, net ". This column represents the effect of the revision on the consolidated balance sheet.

Restructuring Activities

Restructuring Activities	6 Months Ended
	Jun. 30, 2021
Restructuring and Related Activities [Abstract]
RESTRUCTURING ACTIVITIES	RESTRUCTURING ACTIVITIES During second quarter 2021, the Company began the process of a strategic review and began under taking certain actions in order to increase focus on core technologies and markets. On June 10, 2021, the Company announced that, as a result of a strategic review of its research and innovation priorities, it commenced the process of a collective economic layoff in which it proposed a reduction in force of 66 employees in its research and innovation unit, 60 of whom are based in France. The Company has launched an information-consultation process with respect to the contemplated reorganization with the works council of certain of its French subsidiaries, as required by French law. The Company anticipates the reduction in force being finalized in 2021. During June 2021, Chordant has begun the process of ceasing operations. The Company implemented a reduction in workforce action in second quarter 2021, consisting of 18 employees. Additionally, in June 2021, Convida approved a plan to sell certain patents. The proceeds from the sale of these patents will contribute to funding Convida's operations. These assets were evaluated as a separate asset group, and reclassified as assets held for sale. Upon the reclassification, the patents to be sold were recorded at fair value on June 30, 2021, which resulted in the Company recognizing an $11.0 million impairment during the three months ending June 30, 2021. We determined the fair value based upon evaluation of market conditions. The patents held for sale are included within " Prepaid and other current assets " in the consolidated balance sheet. Restructuring charges are estimated based on information available at the time such charges are recorded. Due to the inherent uncertainty involved in estimating restructuring expenses, actual amounts incurred for such activities may differ from amounts initially estimated. The restructuring charges associated with the above activities totaling $13.2 million in second quarter 2021 are presented net of any reimbursement arrangements and include $1.2 million of outside services and other associated costs related to non-recurring consultant and legal fees. We expect additional charges to be recorded in second half of 2021. The following table presents the change in our restructuring liability during the period, which is included in " Other accrued expenses " on our consolidated balance sheet (in thousands): Balance as of December 31, 2020 $ — Accrual 12,285 Cash payments (628) Balance as of June 30, 2021 $ 11,657 The restructuring expenses included in " Restructuring activities " in the condensed consolidated statements of income for the three and six months ended June 30, 2021 were as follows (in thousands): Three months ended June 30, 2021 Six months ended June 30, 2021 Patent impairment $ 11,000 $ 11,000 Severance and other benefits 11,086 11,086 Outside services and other associated costs 1,199 1,199 Reimbursement arrangements (10,040) (10,040) Total $ 13,245 $ 13,245

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2021
Subsequent Events [Abstract]
SUBSEQUENT EVENTS	SUBSEQUENT EVENTSOn August 3, 2021, the Company announced it has entered into a multi-year, worldwide, non-exclusive, royalty bearing license with a subsidiary of Xiaomi. The license covers Xiaomi’s cellular-enabled mobile devices under InterDigital’s standard essential patents related to cellular wireless (including 3G, 4G and 5G), WiFi and HEVC video technology. As part of the agreement the Company and Xiaomi have agreed to terminate all pending patent litigation and other proceedings between the companies. Second quarter 2021 revenue did not include any impact from the Xiaomi agreement, which was executed in third quarter 2021.

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	The accompanying unaudited, condensed consolidated financial statements have been prepared in accordance with the instructions to Form 10-Q and, accordingly, do not include all of the detailed schedules, information and notes necessary to state fairly the financial condition, results of operations and cash flows in conformity with United States generally accepted accounting principles (“GAAP”). The year-end condensed consolidated balance sheet data was derived from audited financial statements, but does not include all disclosures required by GAAP for year-end financial statements. Therefore, these financial statements should be read in conjunction with the financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (our “2020 Form 10-K”) as filed with the Securities and Exchange Commission (“SEC”) on February 18, 2021. Definitions of capitalized terms not defined herein appear within our 2020 Form 10-K. The results of operations for interim periods are not necessarily indicative of the results to be expected for the entire year. We have one reportable segment.
Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the financial statements, as well as the reported amounts of revenues and expenses during the reporting period. Actual results could differ from these estimates.
Reclassifications	Certain reclassifications have been made to prior year amounts to conform to the current year presentation.
New Accounting Guidance	Accounting Standards Update: Simplifying the Accounting for Income Taxes In December 2019, the FASB issued ASU No. 2019-12, "Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes" ("ASU 2019-12"). The amendments in this ASU are intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years beginning after December 15, 2020 with early adoption allowed. We adopted this guidance as of January 1, 2021 and the adoption did not have a material impact on our consolidated financial statements. Accounting Standards Update: Simplifying the Accounting for Convertible Instruments In August 2020, the FASB issued ASU No. 2020-06, “Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging—Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity” (“ASU 2020-06”). The amendments in this ASU are intended to simplify accounting for convertible debt instruments and convertible preferred stock by removing certain accounting models which separate the embedded conversion features from the host contract. ASU 2020-06 also amends certain guidance in ASC 260 on the computation of earnings per share for convertible instruments and contracts on an entity’s own equity. ASU 2020-06 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years, and early adoption is permitted for fiscal years beginning after December 15, 2020. This update permits the use of either the modified retrospective or fully retrospective methods of transition. We elected to early adopt this standard on a modified retrospective approach as of January 1, 2021. This adoption increased long-term debt by $50.2 million at January 1, 2021, which was comprised of $51.6 million of unamortized interest discount and was partially offset by a net increase of $1.4 million equity component of deferred financing costs. This was due to the standard no longer requiring bifurcation of the embedded conversion feature from the host contract on the 2024 Notes, as defined in Note 7, " Obligations ." This adoption also reduced non-cash interest expense starting in 2021 due to the removal of the accretion of the debt discount on the 2024 Notes. Lastly, the adoption requires the use of the if-converted method of calculating diluted earnings per share rather than the treasury stock method for convertible instruments and requires the inclusion of the potential effect of shares settled in cash or shares in the diluted earnings per share calculation. Due to the reduction in non-cash interest expense, this adoption increased both basic and diluted earnings per share by $0.09 in the three months ended June 30, 2021 and $0.17 in the six months ended June 30, 2021. Accounting Standards Update: Issuer’s Accounting for Certain Modifications or Exchanges of Freestanding Equity Classified Written Call Options In May 2021, the FASB issued ASU No. 2021-04. The amendments in this ASU are intended to clarify and reduce diversity in an issuer’s accounting for modifications or exchanges of freestanding equity-classified written call options, including warrants, that remain equity classified after modification or exchange. ASU 2021-04 is effective for fiscal years beginning after December 15, 2021, with early adoption allowed. The Company is currently evaluating the anticipated impact of the adoption of ASU 2021-04 on its consolidated financial statements.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	6 Months Ended
	Jun. 30, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of supplemental cash flow information	The following table presents additional supplemental cash flow information for the six months ended June 30, 2021 and 2020 (in thousands): FOR THE SIX MONTHS ENDED JUNE 30, SUPPLEMENTAL CASH FLOW INFORMATION: 2021 2020 Interest paid $ 4,000 $ 4,712 Income taxes paid, including foreign withholding taxes 4,793 13,788 Non-cash investing and financing activities: Dividend payable 10,794 10,781 Non-cash acquisition of patents — 33,300 Accrued capitalized patent costs and property and equipment 3,561 (742)

Revenue (Tables)

Revenue (Tables)	6 Months Ended
	Jun. 30, 2021
Revenue from Contract with Customer [Abstract]
Schedule of disaggregation of revenue	The following table presents the disaggregation of our revenue for the three and six months ended June 30, 2021 and 2020 (in thousands): Three months ended June 30, 2021 2020 Increase/(Decrease) Variable patent royalty revenue $ 7,323 $ 4,597 $ 2,726 59 % Fixed-fee royalty revenue 69,296 77,338 (8,042) (10) % Current patent royalties a 76,619 81,935 (5,316) (6) % Non-current patent royalties b 9,586 19,249 (9,663) (50) % Total patent royalties 86,205 101,184 (14,979) (15) % Current technology solutions revenue a 1,530 3,314 (1,784) (54) % Total revenue $ 87,735 $ 104,498 $ (16,763) (16) % Six months ended June 30, 2021 2020 Increase/(Decrease) Variable patent royalty revenue $ 14,419 $ 10,543 $ 3,876 37 % Fixed-fee royalty revenue 138,592 143,685 (5,093) (4) % Current patent royalties a 153,011 154,228 (1,217) (1) % Non-current patent royalties b 13,367 19,954 (6,587) (33) % Total patent royalties 166,378 174,182 (7,804) (4) % Current technology solutions revenue a 3,720 6,526 (2,806) (43) % Total revenue $ 170,098 $ 180,708 $ (10,610) (6) % a. Recurring revenues are comprised of current patent royalties, inclusive of Dynamic Fixed-Fee Agreement royalties, and current technology solutions revenue. b. Non-recurring revenues are comprised of non-current patent royalties, which include past patent royalties and royalties from static agreements, as well as patent sales.
Schedule of contracted revenue	Based on contracts signed and committed as of June 30, 2021, we expect to recognize the following revenue from Dynamic Fixed-Fee Agreement payments over the term of such contracts (in thousands): Revenue Remainder 2021 $ 142,886 2022 239,307 2023 44,469 2024 89 2025 and beyond — Total Revenue $ 426,751

Net Income (Loss) Per Share (Ta

Net Income (Loss) Per Share (Tables)	6 Months Ended
	Jun. 30, 2021
Earnings Per Share [Abstract]
Schedule of numerator and the denominator of the basic and diluted	The following tables reconcile the numerator and the denominator of the basic and diluted net income per share computation (in thousands, except for per share data): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Net income applicable to InterDigital, Inc. $ 1,618 $ 22,251 $ 7,189 $ 22,367 Weighted-average shares outstanding: Basic 30,804 30,757 30,820 30,740 Dilutive effect of stock options, RSUs, convertible securities and warrants 385 288 372 242 Diluted 31,189 31,045 31,192 30,982 Earnings per share: Basic $ 0.05 $ 0.72 $ 0.23 $ 0.73 Dilutive effect of stock options, RSUs, convertible securities and warrants — — — (0.01) Diluted $ 0.05 $ 0.72 $ 0.23 $ 0.72
Schedule of excluded from our computation of EPS	Set forth below are the securities and the weighted average number of shares of common stock underlying such securities that were excluded from our computation of EPS for the periods presented (in thousands): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Restricted stock units and stock options 30 218 205 219 Convertible securities (a) — 4,921 — 5,597 Warrants 4,921 6,273 4,921 7,620 Total 4,951 11,412 5,126 13,436 ______________________________ (a) As of December 31, 2020, we made the irrevocable election to settle all conversions of the 2024 Notes through combination settlements of cash and shares of our common stock, with a specified dollar amount of $1,000 per $1,000 principal amount of 2024 Notes and any remaining amounts in shares of our common stock.

Cash, Concentration of Credit_2

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2021
Fair Value Disclosures [Abstract]
Schedule of cash and cash equivalents	The following table provides a reconciliation of total cash, cash equivalents and restricted cash as of June 30, 2021, December 31, 2020 and June 30, 2020 to the captions within the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in thousands): June 30, December 31, June 30, 2021 2020 2020 Cash and cash equivalents $ 410,144 $ 473,474 $ 670,292 Restricted cash included within prepaid and other current assets 741 3,108 5,906 Restricted cash included within other non-current assets 1,081 1,081 1,081 Total cash, cash equivalents and restricted cash $ 411,966 $ 477,663 $ 677,279
Schedule of restricted cash and cash equivalents	The following table provides a reconciliation of total cash, cash equivalents and restricted cash as of June 30, 2021, December 31, 2020 and June 30, 2020 to the captions within the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in thousands): June 30, December 31, June 30, 2021 2020 2020 Cash and cash equivalents $ 410,144 $ 473,474 $ 670,292 Restricted cash included within prepaid and other current assets 741 3,108 5,906 Restricted cash included within other non-current assets 1,081 1,081 1,081 Total cash, cash equivalents and restricted cash $ 411,966 $ 477,663 $ 677,279
Schedule of fair value on a recurring basis	Our financial assets and liabilities that are accounted for at fair value on a recurring basis are presented in the tables below as of June 30, 2021 and December 31, 2020 (in thousands): Fair Value as of June 30, 2021 Level 1 Level 2 Level 3 Total Assets: Money market and demand accounts (a) $ 411,966 $ — $ — $ 411,966 Commercial paper (b) — 248,573 — 248,573 U.S. government securities — 119,472 — 119,472 Corporate bonds, asset backed and other securities — 57,714 — 57,714 Total $ 411,966 $ 425,759 $ — $ 837,725 Fair Value as of December 31, 2020 Level 1 Level 2 Level 3 Total Assets: Money market and demand accounts (a) $ 397,522 $ — $ — $ 397,522 Commercial paper (b) — 285,242 — 285,242 U.S. government securities — 166,223 — 166,223 Corporate bonds, asset backed and other securities — 81,849 — 81,849 Total $ 397,522 $ 533,314 $ — $ 930,836 ______________________________ (a) Primarily included within cash and cash equivalents. (b) As of June 30, 2021 and December 31, 2020, $0.0 million and $80.1 million, respectively, of commercial paper was included within cash and cash equivalents.
Schedule of aggregate fair value	The aggregate fair value of the principal amount of the senior convertible long-term debt is a Level 2 fair value measurement. June 30, 2021 December 31, 2020 Principal Carrying Fair Principal Carrying Fair Senior Convertible Long-Term Debt $ 400,000 $ 394,806 $ 442,520 $ 400,000 $ 343,821 $ 418,760 June 30, 2021 December 31, 2020 Carrying Fair Carrying Fair Technicolor Patent Acquisition Long-Term Debt $ 25,792 $ 33,189 $ 24,171 $ 27,016

Obligations (Tables)

Obligations (Tables)	6 Months Ended
	Jun. 30, 2021
Debt Disclosure [Abstract]
Schedule of carrying value of the 2024 Notes and 2020 Notes	The following table reflects the carrying value of our convertible notes long-term debt as of June 30, 2021 and December 31, 2020 (in thousands): June 30, 2021 December 31, 2020 Principal $ 400,000 $ 400,000 Less: Unamortized interest discount (a) — (51,567) Deferred financing costs (a) (5,194) (4,612) Net carrying amount of the 2024 Notes $ 394,806 $ 343,821 ______________________________ (a) Due to the adoption of ASU 2020-06 on January 1, 2021, the unamortized interest discount was reclassified back to the carrying value of the 2024 Notes. Refer to Note 1, " Basis of Presentation ", for further information regarding this adoption.
Schedule of accretion of the debt discount, and the amortization of financing costs	The following table presents the amount of interest cost recognized, which is included within " Interest Expense" in our condensed consolidated statements of income, for the three and six months ended June 30, 2021 and June 30, 2020 relating to the contractual interest coupon, accretion of the debt discount, and the amortization of deferred financing costs of the 2024 Notes and 2020 Notes (in thousands): Three months ended June 30, 2021 2020 2024 Notes 2024 Notes 2020 Notes Total Contractual coupon interest $ 2,000 $ 2,000 $ — $ 2,000 Accretion of debt discount (a) — 3,255 — 3,255 Amortization of deferred financing costs 402 291 — 291 Total $ 2,402 $ 5,546 $ — $ 5,546 Six months ended June 30, 2021 2020 2024 Notes 2024 Notes 2020 Notes Total Contractual coupon interest $ 4,000 $ 4,000 $ 237 $ 4,237 Accretion of debt discount (a) — 6,477 669 7,146 Amortization of deferred financing costs 800 579 70 649 Total $ 4,800 $ 11,056 $ 976 $ 12,032 ______________________________ (a) Due to the adoption of ASU 2020-06, there is no longer accretion of the debt discount starting January 1, 2021. Refer to Note 1, " Basis of Presentation ", for further information regarding this adoption.

Other Income, Net (Tables)

Other Income, Net (Tables)	6 Months Ended
	Jun. 30, 2021
Other Income and Expenses [Abstract]
Schedule of other income expense, net	The amounts included in " Other income, net " in the condensed consolidated statements of income for the three and six months ended June 30, 2021 and 2020 were as follows (in thousands): Three months ended June 30, Six months ended June 30, 2021 2020 2021 2020 Interest and investment income $ 446 $ 1,342 $ 999 $ 4,219 Other 2,593 2,447 2,764 5,593 Other income, net $ 3,039 $ 3,789 $ 3,763 $ 9,812

Other Assets (Tables)

Other Assets (Tables)	6 Months Ended
	Jun. 30, 2021
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Schedule of Prepaid and Other Current Assets	The amounts included in " Prepaid and other current assets " in the consolidated balance sheet as of June 30, 2021 and December 31, 2020 were as follows (in thousands): As Reported As Revised (a) June 30, 2021 December 31, 2020 December 31, 2020 Tax receivables $ 46,214 $ 69,592 $ 45,262 Prepaid assets 7,417 10,899 10,899 Patents held for sale 6,228 — — Receivable from sale of long-term investments 3,016 — — Operating lease receivable — 817 817 Other current assets 11,922 2,916 2,916 Total Prepaid and other current assets $ 74,797 $ 84,224 $ 59,894
Schedule of Other Assets, Noncurrent	The amounts included in " Other non-current assets, net " in the consolidated balance sheet as of June 30, 2021 and December 31, 2020 were as follows (in thousands): As Reported As Revised (a) June 30, 2021 December 31, 2020 December 31, 2020 Tax receivables $ 27,108 $ — $ 24,330 Goodwill 22,421 22,421 22,421 Right-of-use assets 19,091 22,456 22,456 Long-term investments 14,580 15,489 15,489 Other non-current assets 12,202 13,677 13,677 Total Other non-current assets, net $ 95,402 $ 74,043 $ 98,373 _____________________________ (a) As discussed in Note 1, we revised our prior period presentation of " Prepaid and other current assets " and " Other non-current assets, net ". This column represents the effect of the revision on the consolidated balance sheet.

Restructuring Activities (Table

Restructuring Activities (Tables)	6 Months Ended
	Jun. 30, 2021
Restructuring and Related Activities [Abstract]
Schedule of Restructuring Reserve by Type of Cost	The following table presents the change in our restructuring liability during the period, which is included in " Other accrued expenses " on our consolidated balance sheet (in thousands): Balance as of December 31, 2020 $ — Accrual 12,285 Cash payments (628) Balance as of June 30, 2021 $ 11,657 The restructuring expenses included in " Restructuring activities " in the condensed consolidated statements of income for the three and six months ended June 30, 2021 were as follows (in thousands): Three months ended June 30, 2021 Six months ended June 30, 2021 Patent impairment $ 11,000 $ 11,000 Severance and other benefits 11,086 11,086 Outside services and other associated costs 1,199 1,199 Reimbursement arrangements (10,040) (10,040) Total $ 13,245 $ 13,245

Basis of Presentation - Narrati

Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021USD ($)$ / shares	Jun. 30, 2020$ / shares	Jun. 30, 2021USD ($)segment$ / shares	Jun. 30, 2020$ / shares	Jan. 01, 2021USD ($)	Dec. 31, 2020USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | segment			1
Error in accounting (as a percent)	1.50%		1.50%
Debt Instrument [Line Items]
Net income per common share: basic (in USD per share) | $ / shares	$ 0.05	$ 0.72	$ 0.23	$ 0.73
Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Net income per common share: basic (in USD per share) | $ / shares	$ 0.09		$ 0.17
Senior Convertible Long-Term Debt
Debt Instrument [Line Items]
Unamortized discount	$ 0		$ 0			$ 51,567
Senior Convertible Long-Term Debt | Accounting Standards Update 2020-06
Debt Instrument [Line Items]
Long-term debt					$ (50,200)
Unamortized discount					51,600
Debt issuance costs equity component					$ 1,400

Basis of Presentation - Schedul

Basis of Presentation - Schedule of Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
SUPPLEMENTAL CASH FLOW INFORMATION:
Interest paid	$ 4,000	$ 4,712
Income taxes paid, including foreign withholding taxes	4,793	13,788
Non-cash investing and financing activities:
Dividend payable	10,794	10,781	$ 10,786
Non-cash acquisition of patents	0	33,300
Accrued capitalized patent costs and property and equipment	$ 3,561	$ (742)

Revenue - Disaggregated Revenue

Revenue - Disaggregated Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Disaggregation of Revenue [Line Items]
Revenue	$ 87,735	$ 104,498	$ 170,098	$ 180,708
Increase/(decrease) in disaggregated revenue	$ (16,763)		$ (10,610)
Percentage increase/(decrease) in disaggregated revenue	(16.00%)		(6.00%)
Total patent royalties
Disaggregation of Revenue [Line Items]
Revenue	$ 86,205	101,184	$ 166,378	174,182
Increase/(decrease) in disaggregated revenue	$ (14,979)		$ (7,804)
Percentage increase/(decrease) in disaggregated revenue	(15.00%)		(4.00%)
Total patent royalties | Current revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 76,619	81,935	$ 153,011	154,228
Increase/(decrease) in disaggregated revenue	$ (5,316)		$ (1,217)
Percentage increase/(decrease) in disaggregated revenue	(6.00%)		(1.00%)
Total patent royalties | Non-current revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 9,586	19,249	$ 13,367	19,954
Increase/(decrease) in disaggregated revenue	$ (9,663)		$ (6,587)
Percentage increase/(decrease) in disaggregated revenue	(50.00%)		(33.00%)
Technology solutions
Disaggregation of Revenue [Line Items]
Revenue	$ 1,530	3,314	$ 3,720	6,526
Increase/(decrease) in disaggregated revenue	$ (1,784)		$ (2,806)
Percentage increase/(decrease) in disaggregated revenue	(54.00%)		(43.00%)
Variable patent royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 7,323	4,597	$ 14,419	10,543
Increase/(decrease) in disaggregated revenue	$ 2,726		$ 3,876
Percentage increase/(decrease) in disaggregated revenue	59.00%		37.00%
Fixed-fee royalty revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 69,296	$ 77,338	$ 138,592	$ 143,685
Increase/(decrease) in disaggregated revenue	$ (8,042)		$ (5,093)
Percentage increase/(decrease) in disaggregated revenue	(10.00%)		(4.00%)

Revenue - Narrative (Details)

Revenue - Narrative (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Revenue recognized that had been included in deferred revenue as of the beginning of the period	$ 124.3
Contract assets, current	8.3	$ 9.7
Contract assets, non-current	$ 8.8	$ 8.9

Revenue - Remaining Performance

Revenue - Remaining Performance Obligation (Details) $ in Thousands	Jun. 30, 2021USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-07-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 142,886
Revenue, remaining performance obligation, expected timing of satisfaction, period	6 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 239,307
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 44,469
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 89
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 0
Revenue, remaining performance obligation, expected timing of satisfaction, period	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2026-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Revenue, remaining performance obligation, amount	$ 426,751
Revenue, remaining performance obligation, expected timing of satisfaction, period

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Income Tax Contingency [Line Items]
Effective tax rate	(169.60%)	26.90%
Effective tax rate before valuation allowance is included (as percent)	104.30%	12.50%
Discrete tax expense (benefit)	$ 600	$ 300
Income taxes paid, including foreign withholding taxes	4,793	13,788
Foreign Country
Income Tax Contingency [Line Items]
Income taxes paid, including foreign withholding taxes	$ 4,000	$ 13,400

Net Income (Loss) Per Share - N

Net Income (Loss) Per Share - Numerator and Denominator of Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income applicable to InterDigital, Inc.	$ 1,618	$ 5,571	$ 22,251	$ 116	$ 7,189	$ 22,367
Weighted-average shares outstanding:
Weighted-average shares outstanding: basic (in shares)	30,804		30,757		30,820	30,740
Dilutive effect of stock options, RSUs, convertible securities and warrants (in shares)	385		288		372	242
Weighted-average shares outstanding: diluted (in shares)	31,189		31,045		31,192	30,982
Earnings per share:
Net income per common share: basic (in USD per share)	$ 0.05		$ 0.72		$ 0.23	$ 0.73
Dilutive effect of stock options, RSUs, convertible securities and warrants (in USD per share)	0		0		0	0.01
Net income per common share: diluted (in USD per share)	$ 0.05		$ 0.72		$ 0.23	$ 0.72

Net Income (Loss) Per Share - A

Net Income (Loss) Per Share - Antidilutive Securities Excluded from Earnings Per Share (Details) - USD ($) shares in Thousands	Jun. 03, 2019	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		4,951	11,412	5,126	13,436
Convertible Notes 2024 | Senior Convertible Long-Term Debt
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion converted instrument amount	$ 1,000			$ 1,000
Restricted stock units and stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		30	218	205	219
Convertible securities
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		0	4,921	0	5,597
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount (in shares)		4,921	6,273	4,921	7,620

Litigation and Legal Proceedi_2

Litigation and Legal Proceedings (Details)	Aug. 05, 2020CNY (¥)	Jul. 29, 2020patent	Aug. 28, 2019patent	Aug. 27, 2019patent
Xiaomi
Loss Contingencies [Line Items]
Court fine per day | ¥	¥ 1,000,000
Pending Litigation | U.K. Proceedings
Loss Contingencies [Line Items]
Loss contingency, number of patents alleged infringement				5
Pending Litigation | District Of Delaware Proceedings
Loss Contingencies [Line Items]
Loss contingency, number of patents alleged infringement			8
Pending Litigation | India Proceedings
Loss Contingencies [Line Items]
Loss contingency, number of patents alleged infringement		2
Pending Litigation | India Proceedings One
Loss Contingencies [Line Items]
Loss contingency, number of patents alleged infringement		5
Pending Litigation | India Proceedings Two
Loss Contingencies [Line Items]
Loss contingency, number of patents alleged infringement		3

Cash, Concentration of Credit_3

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Cash and cash equivalents	$ 410,144	$ 473,474	$ 670,292
Restricted cash included within prepaid and other current assets	741	3,108	5,906
Restricted cash included within other non-current assets	1,081	1,081	1,081
Total cash, cash equivalents and restricted cash	$ 411,966	$ 477,663	$ 677,279	$ 757,098

Cash, Concentration of Credit_4

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Narrative (Details) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2021USD ($)	Mar. 31, 2020USD ($)property	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2020
Concentration Risk [Line Items]
Unrealized gain	$ 1,000	$ 5,500
Lease asset impairment		1,100
Lease property, plant and equipment impairment		800
Lease right of use asset impairment		$ 300
Number of abandoned leased properties | property		1
Impairment of Patents held for sale	$ 11,000		$ 11,000	$ 0
Accounts Receivable | Licensee Concentration Risk | Five Largest Licensees
Concentration Risk [Line Items]
Accounts receivable percentage			57.00%		53.00%

Cash, Concentration of Credit_5

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Assets:
Total	$ 837,725	$ 930,836
Amount of commercial paper included in cash and cash equivalents	410,144	473,474	$ 670,292
U.S. government securities
Assets:
Securities	119,472	166,223
Corporate bonds, asset backed and other securities
Assets:
Securities	57,714	81,849
Money market and demand accounts
Assets:
Cash and cash equivalents	411,966	397,522
Commercial Paper
Assets:
Cash and cash equivalents	248,573	285,242
Amount of commercial paper included in cash and cash equivalents	0	80,100
Level 1
Assets:
Total	411,966	397,522
Level 1 | U.S. government securities
Assets:
Securities	0	0
Level 1 | Corporate bonds, asset backed and other securities
Assets:
Securities	0	0
Level 1 | Money market and demand accounts
Assets:
Cash and cash equivalents	411,966	397,522
Level 1 | Commercial Paper
Assets:
Cash and cash equivalents	0	0
Level 2
Assets:
Total	425,759	533,314
Level 2 | U.S. government securities
Assets:
Securities	119,472	166,223
Level 2 | Corporate bonds, asset backed and other securities
Assets:
Securities	57,714	81,849
Level 2 | Money market and demand accounts
Assets:
Cash and cash equivalents	0	0
Level 2 | Commercial Paper
Assets:
Cash and cash equivalents	248,573	285,242
Level 3
Assets:
Total	0	0
Level 3 | U.S. government securities
Assets:
Securities	0	0
Level 3 | Corporate bonds, asset backed and other securities
Assets:
Securities	0	0
Level 3 | Money market and demand accounts
Assets:
Cash and cash equivalents	0	0
Level 3 | Commercial Paper
Assets:
Cash and cash equivalents	$ 0	$ 0

Cash, Concentration of Credit_6

Cash, Concentration of Credit Risk and Fair Value of Financial Instruments - Fair Value of Long-Term Debt (Details) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Technicolor Patent Acquisition Long-Term Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Carrying Value	$ 25,792,000	$ 24,171,000
Fair Value	33,189,000	27,016,000
Senior Convertible Long-Term Debt
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Principal	400,000,000	400,000,000
Carrying Value	394,806,000	343,821,000
Fair Value	$ 442,520,000	$ 418,760,000

Obligations - Technicolor Paten

Obligations - Technicolor Patent Acquisition Long-Term Debt (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Business Acquisition [Line Items]
Interest debt expense		$ 5,546		$ 12,032
Technicolor
Business Acquisition [Line Items]
Effective interest rate acquisition percentage	14.50%		14.50%
Interest debt expense	$ 800	$ 700	$ 1,600	$ 1,500

Obligations - 2024 and 2020 Sen

Obligations - 2024 and 2020 Senior Convertible Notes, and Related Note Hedge and Warrant Transactions (Details) $ / shares in Units, shares in Millions	Jun. 03, 2019USD ($)$ / shares	Jun. 30, 2021USD ($)	Mar. 01, 2020USD ($)	May 31, 2019$ / sharesshares	Mar. 11, 2015USD ($)
Debt Instrument [Line Items]
Initial strike price (in USD per share) | $ / shares				$ 109.43
Convertible Notes 2020
Debt Instrument [Line Items]
Unamortized debt discount and issuance costs			$ 94,900,000
Convertible Debt | Convertible Notes 2024
Debt Instrument [Line Items]
Aggregate principal amount	$ 400,000,000
Debt instrument interest rate, stated percentage	2.00%
Transaction fees and offering expenses	$ 391,600,000
Debt instrument interest rate, effective percentage		2.02%
Initial conversion rate	12.3018
Debt conversion converted instrument amount	$ 1,000	$ 1,000
Initial conversion price (in USD per share) | $ / shares	$ 81.29
Convertible note hedge (in shares) | shares				4.9
Anti-dilution adjustments of common stock (in shares) | shares				4.9
Convertible Debt | Convertible Notes 2020
Debt Instrument [Line Items]
Aggregate principal amount					$ 316,000,000
Debt instrument interest rate, stated percentage					1.50%

Obligations - Carrying Value of

Obligations - Carrying Value of 2024 Notes and 2020 Notes (Details) - Convertible Debt - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Principal	$ 400,000,000	$ 400,000,000
Less:
Unamortized interest discount	0	(51,567,000)
Deferred financing costs	(5,194,000)	(4,612,000)
Net carrying amount of the 2024 Notes	$ 394,806,000	$ 343,821,000

Obligations - Accretion of Debt

Obligations - Accretion of Debt Discount and Amortization of Financing Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Debt Instrument [Line Items]
Contractual coupon interest		$ 2,000		$ 4,237
Accretion of debt discount(a)		3,255		7,146
Amortization of deferred financing costs		291		649
Total		5,546		12,032
Convertible Debt | Convertible Notes 2024
Debt Instrument [Line Items]
Contractual coupon interest	$ 2,000	2,000	$ 4,000	4,000
Accretion of debt discount(a)	0	3,255	0	6,477
Amortization of deferred financing costs	402	291	800	579
Total	$ 2,402	5,546	$ 4,800	11,056
Convertible Debt | Convertible Notes 2020
Debt Instrument [Line Items]
Contractual coupon interest		0		237
Accretion of debt discount(a)		0		669
Amortization of deferred financing costs		0		70
Total		$ 0		$ 976

Obligations - Additional Inform

Obligations - Additional Information (Details)	May 31, 2019
Technicolor
Business Acquisition [Line Items]
Receive future cash receipts percentage	42.50%

Variable Interest Entities (Det

Variable Interest Entities (Details) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2021USD ($)	Mar. 31, 2021USD ($)	Jun. 30, 2020USD ($)	Mar. 31, 2020USD ($)	Jun. 30, 2021USD ($)variable_interest_entity	Jun. 30, 2020USD ($)	Dec. 31, 2020USD ($)
Variable Interest Entity [Line Items]
Assets	$ 1,497,083				$ 1,497,083		$ 1,616,275
Liabilities	780,838				780,838		819,709
Cash and cash equivalents	410,144		$ 670,292		410,144	$ 670,292	473,474
Patents, net	381,564				381,564		418,343
Accounts receivable	12,003				12,003		16,008
Noncontrolling interests	(8,415)	$ (1,613)	(1,660)	$ (1,777)	(10,028)	(3,437)
Chordant
Variable Interest Entity [Line Items]
Noncontrolling interests	(2,200)		200		(2,300)	500
Convida
Variable Interest Entity [Line Items]
Noncontrolling interests	(6,200)		(7,700)		$ (6,200)	(7,700)
Other Parties
Variable Interest Entity [Line Items]
Noncontrolling interests			$ 1,500			$ 2,900
Primary Beneficiary
Variable Interest Entity [Line Items]
Number of variable interest entities | variable_interest_entity					3
Assets	41,300				$ 41,300		62,000
Liabilities	5,700				5,700		5,800
Cash and cash equivalents	16,200				16,200		24,500
Accounts receivable and prepaid assets	7,500				7,500
Patents, net	$ 17,600				$ 17,600		35,200
Accounts receivable							$ 2,300

Other Income, Net - Other Incom

Other Income, Net - Other Income, Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Interest and investment income	$ 446	$ 1,342	$ 999	$ 4,219
Other	2,593	2,447	2,764	5,593
Other income, net	$ 3,039	$ 3,789	$ 3,763	$ 9,812

Other Income, Net - Narrative (

Other Income, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2021	Jun. 30, 2021	Jun. 30, 2020
Other Income and Expenses [Abstract]
Gain from observable price changes in orderly transactions of a long-term strategic investment	$ 1.9	$ 1	$ 5.5

Other Assets - Prepaid and Othe

Other Assets - Prepaid and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Current Assets [Line Items]
Tax receivables	$ 46,214	$ 45,262
Prepaid assets	7,417	10,899
Patents held for sale	6,228	0
Receivable from sale of long-term investments	3,016	0
Operating lease receivable	0	817
Other current assets	11,922	2,916
Total Prepaid and other current assets	$ 74,797	59,894
As Reported
Other Current Assets [Line Items]
Tax receivables		69,592
Prepaid assets		10,899
Patents held for sale		0
Receivable from sale of long-term investments		0
Operating lease receivable		817
Other current assets		2,916
Total Prepaid and other current assets		$ 84,224

Other Assets - Other Non-Curren

Other Assets - Other Non-Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Other Non-Current Assets [Line Items]
Tax receivables	$ 27,108	$ 24,330
Goodwill	22,421	22,421
Right-of-use assets	19,091	22,456
Long-term investments	14,580	15,489
Other non-current assets	12,202	13,677
Other Assets, Noncurrent, Total	$ 95,402	98,373
As Reported
Other Non-Current Assets [Line Items]
Tax receivables		0
Goodwill		22,421
Right-of-use assets		22,456
Long-term investments		15,489
Other non-current assets		13,677
Other Assets, Noncurrent, Total		$ 74,043

Restructuring Activities - Narr

Restructuring Activities - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended		7 Months Ended
	Jun. 30, 2021USD ($)employee	Jun. 30, 2021USD ($)	Jun. 30, 2020USD ($)	Dec. 31, 2021employee
Restructuring Cost and Reserve [Line Items]
Patent impairment | $	$ 11,000	$ 11,000	$ 0
Outside services and other associated costs | $	$ 1,199	$ 1,199
Chordant Cease of Operations
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee	18
Patents
Restructuring Cost and Reserve [Line Items]
Patent impairment | $	$ 11,000
Forecast | Economic Reduction in Force
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee				66
Forecast | FRANCE | Economic Reduction in Force
Restructuring Cost and Reserve [Line Items]
Number of positions eliminated | employee				60

Restructuring Activities - Rest

Restructuring Activities - Restructuring Activity Included in Other Accrued Expenses (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2021USD ($)
Restructuring Reserve [Roll Forward]
Beginning balance	$ 0
Accrual	12,285
Cash payments	(628)
Ending balance	$ 11,657

Restructuring Activities - Re_2

Restructuring Activities - Restructuring Activity Included in Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Restructuring and Related Activities [Abstract]
Patent impairment	$ 11,000		$ 11,000	$ 0
Severance and other benefits	11,086		11,086
Outside services and other associated costs	1,199		1,199
Reimbursement arrangements	(10,040)		(10,040)
Total	$ 13,245	$ 0	$ 13,245	$ 0