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Interest and Other Income (Loss), net - Schedule Of Interest And Other Income (Loss), net (Parenthetical) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Preferred equity ownership percentage | 24.40% |  |
PGRESS Equity Holdings L.P. [Member] |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Percentage of income from preferred equity investments | 100.00% |  |
Preferred equity investment income, attributable to parent | $ 111 | $ 890 | $ 1,029
Preferred equity ownership percentage | 24.40% |  |
PGRESS Equity Holdings L.P. [Member] | 2 Herald Square [Member] |  |  |
Schedule Of Investment Income Reported Amounts By Category [Line Items] |  |  |
Preferred equity ownership percentage |  |  | 24.40%
Valuation allowance on preferred equity investment, attributable to parent |  |  | $ 4,780
Valuation allowance on preferred equity investment attributable to noncontrolling interests |  |  | $ 14,808

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