Interest and Other Income, net - Schedule Of Interest And Other Income, net (Parenthetical) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
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]
Preferred equity investment income, attributable to parent	$ 227	$ 111	$ 669
Preferred equity ownership percentage		24.40%