Debt - Components of Mortgage Debt (Details) - USD ($) $ in Thousands	May 06, 2020	Sep. 30, 2020	Dec. 31, 2019
Participating Mortgage Loans [Line Items]
Property Carrying Value		$ 1,097,736
Total debt before unamortized debt issue costs		667,052	$ 586,860
Unamortized mortgage debt issue costs		(1,105)	(1,395)
Total debt outstanding		$ 665,947	585,465
Senior Unsecured Revolving Credit Facility
Participating Mortgage Loans [Line Items]
Interest Rate		3.09%
Property Carrying Value		$ 393,215
Total debt before unamortized debt issue costs		$ 173,000	90,000
Senior Unsecured Revolving Credit Facility | LIBOR | Minimum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	2.50%
Senior Unsecured Revolving Credit Facility | LIBOR | Maximum
Participating Mortgage Loans [Line Items]
Basis spread on variable rate	3.00%
Construction loan
Participating Mortgage Loans [Line Items]
Interest Rate		7.75%
Property Carrying Value		$ 33,719
Total debt before unamortized debt issue costs		$ 3,923	0
Residence Inn by Marriott New Rochelle, NY
Participating Mortgage Loans [Line Items]
Interest Rate		5.75%
Property Carrying Value		$ 21,835
Total debt before unamortized debt issue costs		$ 12,717	12,936
Residence Inn by Marriott San Diego, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.66%
Property Carrying Value		$ 43,836
Total debt before unamortized debt issue costs		$ 26,798	27,272
Homewood Suites by Hilton San Antonio, TX
Participating Mortgage Loans [Line Items]
Interest Rate		4.59%
Property Carrying Value		$ 28,887
Total debt before unamortized debt issue costs		$ 15,290	15,563
Residence Inn by Marriott Vienna, VA
Participating Mortgage Loans [Line Items]
Interest Rate		4.49%
Property Carrying Value		$ 31,267
Total debt before unamortized debt issue costs		$ 20,911	21,291
Courtyard by Marriott Houston, TX
Participating Mortgage Loans [Line Items]
Interest Rate		4.19%
Property Carrying Value		$ 30,376
Total debt before unamortized debt issue costs		$ 17,237	17,559
Hyatt Place Pittsburgh, PA
Participating Mortgage Loans [Line Items]
Interest Rate		4.65%
Property Carrying Value		$ 34,058
Total debt before unamortized debt issue costs		$ 21,157	21,520
Residence Inn by Marriott Bellevue, WA
Participating Mortgage Loans [Line Items]
Interest Rate		4.97%
Property Carrying Value		$ 62,765
Total debt before unamortized debt issue costs		$ 43,220	43,857
Residence Inn by Marriott Garden Grove, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.79%
Property Carrying Value		$ 41,368
Total debt before unamortized debt issue costs		$ 31,615	32,053
Residence Inn by Marriott Silicon Valley I, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.64%
Property Carrying Value		$ 76,651
Total debt before unamortized debt issue costs		$ 63,674	64,406
Residence Inn by Marriott Silicon Valley II, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.64%
Property Carrying Value		$ 84,863
Total debt before unamortized debt issue costs		$ 69,471	70,270
Residence Inn by Marriott San Mateo, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.64%
Property Carrying Value		$ 63,382
Total debt before unamortized debt issue costs		$ 47,755	48,305
Residence Inn by Marriott Mountain View, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.64%
Property Carrying Value		$ 50,346
Total debt before unamortized debt issue costs		$ 37,241	37,670
SpringHill Suites by Marriott Savannah, GA
Participating Mortgage Loans [Line Items]
Interest Rate		4.62%
Property Carrying Value		$ 33,639
Total debt before unamortized debt issue costs		$ 29,477	29,817
Hilton Garden Inn Marina del Rey, CA
Participating Mortgage Loans [Line Items]
Interest Rate		4.68%
Property Carrying Value		$ 38,339
Total debt before unamortized debt issue costs		$ 20,604	20,931
Homewood Suites by Hilton Billerica, MA
Participating Mortgage Loans [Line Items]
Interest Rate		4.32%
Property Carrying Value		$ 13,252
Total debt before unamortized debt issue costs		$ 15,484	15,693
Hampton Inn & Suites Houston Medical Center, TX
Participating Mortgage Loans [Line Items]
Interest Rate		4.25%
Property Carrying Value		$ 15,938
Total debt before unamortized debt issue costs		$ 17,478	$ 17,717