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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2020
Fair Value Disclosures [Abstract] |
Schedule of Assets and Liabilities Held and their Related Classifications Under the Fair Value Hierarchy | The following is a summary of assets, liabilities and redeemable noncontrolling interests and their related classifications under the fair value hierarchy:
| December 31, 2020
| Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash (1) | $ | 33,671 |  |  | $ | 33,671 |  |  | $ | — |  |  | $ | — |
Marketable securities-short term (2) | — |  |  | — |  |  | — |  |  | — |
Marketable securities-long term (2) | — |  |  | — |  |  | — |  |  | — |
Total assets | $ | 33,671 |  |  | $ | 33,671 |  |  | $ | — |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Temporary equity |  |  |  |  |  |  |
Redeemable noncontrolling interests (3) | $ | 12,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,500 |
Total temporary equity | $ | 12,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,500 |
| December 31, 2019
| Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Assets |  |  |  |  |  |  |
Cash, cash equivalents and restricted cash (1) | $ | 39,001 |  |  | $ | 39,001 |  |  | $ | — |  |  | $ | — |
Marketable securities-short term (2) | 11 |  |  | — |  |  | 11 |  |  | — |
Marketable securities-long term (2) | — |  |  | — |  |  | — |  |  | — |
Total assets | $ | 39,012 |  |  | $ | 39,001 |  |  | $ | 11 |  |  | $ | — |
Liabilities |  |  |  |  |  |  |
Total liabilities | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Temporary Equity |  |  |  |  |  |  |
Redeemable noncontrolling interests (3) | $ | 12,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,500 |
Total temporary equity | $ | 12,500 |  |  | $ | — |  |  | $ | — |  |  | $ | 12,500 |
________________________________ (1)Cash equivalents primarily included money market funds. (2)Marketable securities are comprised of municipal bonds, certificates of deposit, corporate bonds, treasury bonds, and mutual funds. (3)Put arrangements held by the noncontrolling interests in certain of the Company’s joint ventures.
Schedule of Estimated Fair Value of Investments in Marketable Equity Securities | At December 31, 2020, the estimated fair value of investments in marketable equity securities, were as follows:
Balance at December 31, 2019 |  | $ | 11 |
Mutual funds purchases |  | — |
Mutual funds sales |  | (11) |
Realized gains (losses) |  | — |
Balance at December 31, 2020 |  | $ | — |
Schedule of Changes in Fair Value of Level 3 | The changes in fair value of the Company’s Level 3 redeemable noncontrolling interests during the year ended December 31, 2020 were as follows:
Balance at December 31, 2019 | $ | 12,500 |
Fair value adjustment | (344) |
Net income attributable to redeemable noncontrolling interests | 344 |
Balance at December 31, 2020 | $ | 12,500 |

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- Definition Tabular disclosure of the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets), and gains or losses recognized in other comprehensive income (loss) and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs) by class of liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19279-110258 + Details
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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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