Leases - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee Lease Description [Line Items]
Right-of-use asset	$ 3,700
Lease liabilities	4,617
Rent expense	363
Ground Rent Expense within Property Expenses
Lessee Lease Description [Line Items]
Rent expense	100
Office and Equipment Leases within General and Administrative Expense
Lessee Lease Description [Line Items]
Rent expense	100
Ground Operating Leases
Lessee Lease Description [Line Items]
Lease liabilities	$ 100
ASU 2016-02
Lessee Lease Description [Line Items]
Right-of-use asset		$ 4,800
Lease liabilities		4,800
Accrued Rent Expense Reclassified from Accrued Liabilities and Other Payables | ASU 2016-02
Lessee Lease Description [Line Items]
Right-of-use asset		(100)
Acquired Above-Market Lease Liabilities, Net, Reclassified from Intangible Lease Liabilities, Net | ASU 2016-02
Lessee Lease Description [Line Items]
Right-of-use asset		(1,200)
Acquired Below-Market Lease Assets, Net, Reclassified from Intangible Lease Assets, Net | ASU 2016-02
Lessee Lease Description [Line Items]
Right-of-use asset		100
Prepaid Lease Payments | ASU 2016-02
Lessee Lease Description [Line Items]
Right-of-use asset		$ 200