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Investments and Fair Value Measurements (Tables)
 6 Months Ended
Jun. 30, 2022
Fair Value Disclosures [Abstract]  
Company's Recurring Financial Assets and Liabilities Subject to Fair Value Measurements
The Company’s financial assets and liabilities subject to fair value measurements were as follows:
Fair Value Measurements as of June 30, 2022
TotalQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)

Significant Unobservable Inputs
(Level 3)
Assets:
Money market funds (1)
$210,258 $210,258 $— $— 
Commercial paper (1)
49,143 — 49,143 — 
Certificates of deposit (2)
110 — 110 — 
Money market funds securing legal bonds (2)
24,000 24,000 — — 
Investment securities at fair value
   Equity securities at fair value
   Marketable equity securities
14,967 14,967 — — 
   Mutual funds invested in debt securities
22,056 22,056 — — 
         Total equity securities at fair value
37,023 37,023 — — 
    Debt securities available for sale
U.S. government securities
3,072 — 3,072 — 
Corporate securities
50,827 — 50,827 — 
U.S. government and federal agency
25,728 — 25,728 — 
Commercial paper
4,529 — 4,529 — 
Foreign fixed-income securities
1,215 — 1,215 — 
Total debt securities available for sale
85,371 — 85,371 — 
Total investment securities at fair value
122,394 37,023 85,371 — 
Long-term investments
Long-term investment securities at fair value (3)
29,090 — — — 
Total$434,995 $271,281 $134,624 $— 
Liabilities:
Fair value of contingent liability$182 $— $— $182 
Total$182 $— $— $182 
(1)     Amounts included in Cash and cash equivalents on the condensed consolidated balance sheets.
(2)    Amounts included in current restricted assets and non-current restricted assets on the condensed consolidated balance sheets.
(3)    In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
Fair Value Measurements as of December 31, 2021
TotalQuoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)

Significant Unobservable Inputs
(Level 3)
Assets:
Money market funds (1)
$130,583 $130,583 $— $— 
Commercial paper (1)
24,426 24,426 — 
Certificates of deposit (2)
110 110 — 
Investment securities at fair value
   Equity securities at fair value
   Marketable equity securities
19,560 19,560 — — 
   Mutual funds invested in debt securities
23,221 23,221 — — 
         Total equity securities at fair value
42,781 42,781 — — 
    Debt securities available for sale
U.S. government securities
6,481 — 6,481 — 
Corporate securities
47,531 — 47,531 — 
U.S. government and federal agency
19,572 — 19,572 — 
Commercial paper
29,103 — 29,103 — 
Foreign fixed-income securities
1,219 — 1,219 — 
Total debt securities available for sale
103,906 — 103,906 — 
Total investment securities at fair value
146,687 42,781 103,906 — 
Long-term investments
Long-term investment securities at fair value (3)
32,089 — — — 
Total$333,895 $173,364 $128,442 $— 
Liabilities:
Fair value of contingent liability$2,646 $— $— $2,646 
Total$2,646 $— $— $2,646 
(1)     Amounts included in Cash and cash equivalents on the condensed consolidated balance sheets.
(2)    Amounts included in current restricted assets and non-current restricted assets on the condensed consolidated balance sheets.
(3)    In accordance with Subtopic 820-10, investments that are measured at fair value using the NAV practical expedient are not classified in the fair value hierarchy.
Nonrecurring Fair Value Measurements
The Company’s investments in real estate ventures subject to nonrecurring fair value measurements are as follows:
Fair Value Measurement Using:
Year Ended December 31,
2021		Quoted Prices in Active Markets for Identical Assets
(Level 1)
Significant Other Observable Inputs
(Level 2)

Significant Unobservable Inputs
(Level 3)
Impairment ChargeTotal
Assets:
Investments in real estate ventures
$2,713 $— $— $— $—