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Cash, Concentration of Credit Risk and Fair Value of Financial Instruments
 6 Months Ended
Jun. 30, 2022
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, 2022, December 31, 2021 and June 30, 2021 to the captions within the condensed consolidated balance sheets and condensed consolidated statements of cash flows (in thousands):
 June 30,December 31,June 30,
 202220212021
Cash and cash equivalents$833,533 $706,282 $410,144 
Restricted cash included within prepaid and other current assets10,578 5,861 741 
Restricted cash included within other non-current assets1,081 1,081 1,081 
Total cash, cash equivalents and restricted cash$845,192 $713,224 $411,966 
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, 2022 three licensees comprised 84% and as of December 31, 2021 four licensees comprised 66% 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, 2022 and December 31, 2021 (in thousands):
 Fair Value as of June 30, 2022
 Level 1Level 2Level 3Total
Assets:    
Money market and demand accounts (a)
$845,192 $— $— $845,192 
Commercial paper (b)
— 9,993 — 9,993 
U.S. government securities— 43,188 — 43,188 
Corporate bonds, asset backed and other securities— 13,895 — 13,895 
  Total$845,192 $67,076 $— $912,268 
 Fair Value as of December 31, 2021
 Level 1Level 2Level 3Total
Assets:    
Money market and demand accounts (a)
$705,725 $— $— $705,725 
Commercial paper(b)
— 158,452 — 158,452 
U.S. government securities— 51,301 — 51,301 
Corporate bonds, asset backed and other securities— 33,091 — 33,091 
  Total$705,725 $242,844 $— $948,569 
______________________________
(a)Primarily included within cash and cash equivalents.
(b)As of June 30, 2022 and December 31, 2021, $0.0 million and $7.5 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 2022 and 2021, we recognized $1.6 million and $1.0 million, respectively, of gains resulting from observable price changes of our long-term strategic investments, which were included within “Other (expense) income, net” in the condensed consolidated statement of income.
Patents
During second quarter 2021, a non-controlled subsidiary that we consolidate for financial statement purposes approved a plan to sell certain patent assets, which were classified as held-for sale. These patents held for sale are recorded at fair value on June 30, 2022 and are included within "Prepaid and other current assets" in the condensed consolidated balance sheet. We determined the fair value based upon evaluation of market conditions and recognized an $11.0 million patent impairment during the second quarter 2021.
During fourth quarter 2021, we renewed our multi-year, worldwide, non-exclusive patent license agreement with Sony Corporation of America ("Sony"). A portion of the consideration for the agreement was in the form of patents, which we received in March 2022. We have determined the fair value of the patents for determining the transaction price for revenue recognition purposes, which was estimated to be $30.1 million utilizing the income and market approaches. The value is amortized as a non-cash expense over the patents' estimated useful lives.
Fair Value of Long-Term Debt
Convertible Notes
The principal amount, carrying value and related estimated fair value of the Company's Convertible Notes reported in the condensed consolidated balance sheets as of June 30, 2022 and December 31, 2021 was as follows (in thousands). The aggregate fair value of the principal amount of the Convertible Notes is a Level 2 fair value measurement.
June 30, 2022December 31, 2021
Principal
Amount		Carrying
Value		Fair
Value		Principal
Amount		Carrying
Value		Fair
Value
2027 Senior Convertible Long-Term Debt$460,000 $450,183 $467,452 $— $— $— 
2024 Senior Convertible Long-Term Debt$126,174 $125,065 $123,259 $400,000 $395,632 $437,760 
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, 2022 and December 31, 2021 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, 2022December 31, 2021
Carrying
Value		Fair
Value		Carrying
Value		Fair
Value
Technicolor Patent Acquisition Long-Term Debt$28,997 $28,103 $27,113 $28,569