Secured Revolving Credit Facility & Term Loan Payable - Additional Information (Detail) - USD ($)							12 Months Ended
	Oct. 22, 2021	Mar. 27, 2020	Sep. 11, 2019	Jul. 31, 2018	Jul. 27, 2017	Dec. 02, 2015	Dec. 31, 2021	Dec. 31, 2020
Line Of Credit Facility [Line Items]
Proceeds from secured revolving credit facility								$ 10,000,000
Credit facility, outstanding								50,000,000
Unamortized loan costs							$ 3,690,000	4,618,000
Secured Revolving Credit Facility [Member] | Other Assets [Member]
Line Of Credit Facility [Line Items]
Unamortized loan costs								$ 100,000
Revolving Line of Credit Facility [Member] | Other Assets [Member]
Line Of Credit Facility [Line Items]
Unamortized loan costs							$ 100,000
Key Bank [Member] | Operating Partnership [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, maximum borrowing capacity						$ 50,000,000.0
Line of Credit facility term						2 years
Line of Credit facility extended maturity period						1 year
Line Of Credit facility description							Line of credit facility, with an initial term of two years, with a one-year extension option, subject to certain other customary conditions.
Minimum principal amount							$ 25,000,000.0
Line of credit facility, maturity date			Jun. 30, 2022	Jun. 30, 2020	Feb. 28, 2018
Line of credit facility, additional extension option maturity date								Jun. 30, 2019
Proceeds from secured revolving credit facility		$ 10,000,000.0
Key Bank [Member] | Operating Partnership [Member] | Interest Expense [Member]
Line Of Credit Facility [Line Items]
Amortization of loan costs							$ 100,000	$ 100,000
Key Bank [Member] | Operating Partnership [Member] | Amended and Restated Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, maximum borrowing capacity	$ 60,000,000
Line Of Credit facility description							The Amended and Restated Credit Agreement provides for a $60 million senior secured credit facility (the “Credit Facility”), consisting of (i) a $10 million revolving line of credit facility, with an initial term of three years and two one-year extension options, subject to certain other customary conditions (the “Revolver”) and (ii) a $50 million term loan facility, with an initial term of four years and a one-year extension option and subject to certain other customary conditions, which was funded in a single advance on October 22, 2021 (the “Term Loan”).
Credit facility capacity available for issuance of letters of credit and swing line loans	10,000,000
Loan costs paid with Credit facility	500,000
Maximum borrowing capacity under incremental credit facility	$ 125,000,000
Line of credit facility, interest rate description							Borrowings under the Credit Facility bear interest at a rate equal to, at the Operating Partnership’s option, either (1) the applicable average LIBOR rate as shown in Reuters Screen LIBOR01 Page (or any successor service, or commercially available source providing such quotations); provided if the rate shown on Reuters Screen LIBOR01 Page (or any successor service) shall be less than zero, such rate shall be deemed to be zero, or (2) a base rate determined by reference to the greatest of (a) the fluctuating annual rate of interest announced from time to time by Key Bank as its “prime rate,” (b) 0.50% above the federal funds effective rate, or (c) then applicable LIBOR for an interest period of one (1) month plus 1.00% per annum; provided that in no event shall the Base Rate be less than zero, and in each case of clauses (1) and (2), plus an applicable margin, depending upon the overall leverage of the properties and whether the loan is under the Revolver or Term Loan facilities.
Key Bank [Member] | Operating Partnership [Member] | Amended and Restated Credit Agreement [Member] | Usage Less Than 50% [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, commitment fee percentage	0.20%
Key Bank [Member] | Operating Partnership [Member] | Amended and Restated Credit Agreement [Member] | Usage 50% or Greater [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, commitment fee percentage	0.15%
Key Bank [Member] | Operating Partnership [Member] | Revolving Line of Credit Facility [Member] | Amended and Restated Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, maximum borrowing capacity	$ 10,000,000
Line of Credit facility term	3 years
Line of Credit facility extended maturity period	1 year
Key Bank [Member] | Operating Partnership [Member] | Term Loan [Member] | Amended and Restated Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, maximum borrowing capacity	$ 50,000,000
Line of Credit facility term	4 years
Line of Credit facility extended maturity period	1 year
Key Bank [Member] | Operating Partnership [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			1.40%	1.50%		2.00%
Key Bank [Member] | Operating Partnership [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			1.90%	2.00%		2.50%
Swing loan							$ 5,000,000.0
Key Bank [Member] | Operating Partnership [Member] | Federal Reserve Bank Of Cleveland [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			0.50%	0.50%		0.50%
Key Bank [Member] | Operating Partnership [Member] | Federal Reserve Bank Of Cleveland [Member] | Amended and Restated Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility	0.50%
Key Bank [Member] | Operating Partnership [Member] | LIBOR [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			1.00%	1.00%		1.00%
Reduction of applicable margin on credit facility			0.10%
Credit facility, outstanding							$ 0	$ 50,000,000.0
Key Bank [Member] | Operating Partnership [Member] | LIBOR [Member] | Amended and Restated Credit Agreement [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility	1.00%
Key Bank [Member] | Operating Partnership [Member] | LIBOR [Member] | Secured Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Reduction of applicable margin on credit facility				0.50%
Key Bank [Member] | Operating Partnership [Member] | LIBOR [Member] | Minimum [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			2.40%	2.50%		3.00%
Key Bank [Member] | Operating Partnership [Member] | LIBOR [Member] | Maximum [Member]
Line Of Credit Facility [Line Items]
Applicable margin range on credit facility			2.90%	3.00%		3.50%
Key Bank [Member] | Operating Partnership [Member] | If less than 50% of facility used [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, commitment fee percentage							0.30%
Key Bank [Member] | Operating Partnership [Member] | If more than 50% of facility used [Member]
Line Of Credit Facility [Line Items]
Line of Credit facility, commitment fee percentage							0.20%
Key Bank [Member] | Operating Partnership [Member] | Base Rate [Member]
Line Of Credit Facility [Line Items]
Reduction of applicable margin on credit facility			0.10%
Key Bank [Member] | Operating Partnership [Member] | Base Rate [Member] | Secured Revolving Credit Facility [Member]
Line Of Credit Facility [Line Items]
Reduction of applicable margin on credit facility				0.50%
Term Loan [Member]
Line Of Credit Facility [Line Items]
Interest Rate							2.52%
Outstanding borrowings							$ 50,000,000.0
Term Loan [Member] | Term Loan Payable [Member]
Line Of Credit Facility [Line Items]
Unamortized loan costs							$ 400,000