Other balance sheet items - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Total accumulated amortization	$ (4,154)		$ (4,154)		$ (2,900)
Indefinite-lived Intangible Assets [Line Items]
Total gross carrying value	12,682		12,682		11,308
Total net carrying value	8,528		8,528		8,408
Amortization expense for intangible assets	600	$ 200	1,300	$ 800
Casino and other licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	875		875		875
Management contract
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	1,900		1,900		1,900
Total accumulated amortization	(214)		(214)		(143)
Net carrying value, Finite-lived intangible assets	1,686		1,686		1,757
Enterprise resource planning system
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	5,633		5,633		5,187
Total accumulated amortization	(941)		(941)		(437)
Net carrying value, Finite-lived intangible assets	4,692		4,692		4,750
Finite-lived intangible assets placed into service during period			$ 1,400		2,600
Estimated useful life			7 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	4,274		$ 4,274		3,346
Total accumulated amortization	(2,999)		(2,999)		(2,320)
Net carrying value, Finite-lived intangible assets	$ 1,275		$ 1,275		$ 1,026