Segment Reporting - Schedule of Total Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020	Jun. 30, 2020
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 248,557	$ 162,838	$ 162,838
Operating segments | Healthcare
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	83,071		76,166
Operating segments | Office
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	38,359		35,788
Operating segments | Industrial
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	31,015		31,143
Operating segments | Multifamily
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	84,694		13,118
Corporate, non-segment
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 11,418		$ 6,623