Summary of Significant Accounting Policies - Summary of Interest and Real Estate Taxes Expensed in Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Real Estate Investment Property At Cost [Abstract]
Interest incurred and expensed from entity level borrowings	$ 97	$ 0
Interest incurred and expensed for inactive projects	61	41
Real estate taxes incurred and expensed for inactive projects	13	0
Interest and real estate tax expense	$ 171	$ 41

Aggregate amount of interest expense on all borrowings.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.7,8)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

Name:	us-gaap_InterestExpenseBorrowings
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration