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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2022
Fair Value of Financial Instruments [Abstract]  
Schedule of Cash, Cash Equivalents and Debt Investments by Significant Category

December 31, 2022

Adjusted cost

Unrealized Gains

Unrealized Losses

Fair Value

Cash and Cash Equivalents

Current Investments

Long-term Investments

Cash

$

75,829

$

-

$

-

$

75,829

$

75,829

$

-

$

-

Level 1(1)

Money market funds

232,477

-

-

232,477

232,477

-

-

Time deposits

75,694

-

-

75,694

75,694

-

-

U.S. Treasury securities

847,354

63

14,355

833,062

-

515,136

332,218

Subtotal

1,155,525

63

14,355

1,141,233

308,171

515,136

332,218

Level 3

Corporate debt security(2)

17,900

-

700

17,200

-

-

17,900

Note receivable(3)

4,860

222

-

5,082

-

-

5,082

Subtotal

22,760

222

700

22,282

-

-

22,982

Total

$

1,254,114

$

285

$

15,055

$

1,239,344

$

384,000

$

515,136

$

355,200

December 31, 2021

Adjusted cost

Unrealized Gains

Unrealized Losses

Fair Value

Cash and Cash Equivalents

Current Investments

Long-term Investments

Cash

$

119,639

$

-

$

-

$

119,639

$

119,639

$

-

$

-

Level 1(1)

Money market funds

547,530

-

-

547,530

547,530

-

-

Time deposits

148,205

-

-

148,205

148,205

-

-

U.S. Treasury securities

501,288

-

1,116

500,172

-

260,945

240,343

Subtotal

1,197,023

-

1,116

1,195,907

695,735

260,945

240,343

Level 3

Corporate debt security(2)

18,000

-

-

18,000

-

-

18,000

Note receivable(3)

-

-

-

-

-

-

-

Subtotal

18,000

-

-

18,000

-

-

18,000

Total

$

1,334,662

$

-

$

1,116

$

1,333,546

$

815,374

$

260,945

$

258,343

(1) Level 1: Quoted prices in active markets for identical assets or liabilities that the entity has the ability to access.

(2) The fair value of the corporate debt security is measured using Level 3 (unobservable) inputs. We determined the fair value for the corporate debt security using an internally-developed valuation model and unobservable inputs include credit and liquidity spreads and effective maturity.

(3) We have elected to measure our investment in a convertible note receivable of a private company at fair value under the fair value option. The fair value of the note receivable is measured using Level 3 (unobservable) inputs. We determined the fair value for the note receivable using an internally-developed valuation model and unobservable inputs include estimates of the equity value of the underlying business and the timing and probability of future financing events.

Summary of Assets Measured at Fair Value on Nonrecurring Basis

December 31,

Level

2022

2021

Leasehold improvements, property and equipment, net

3

$

264

$

1,041

Operating lease assets

3

713

2,791

Total

$

977

$

3,832