Other balance sheet items - Schedule of Other Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Total accumulated amortization	$ (2,900)	$ (1,928)
Net carrying value, Finite-lived intangible assets	7,533
Indefinite-lived Intangible Assets [Line Items]
Total gross carrying value	11,308	8,031
Total net carrying value	8,408	6,103
Amortization expense for intangibles	1,100	1,000	$ 900
Casino and other Licenses
Indefinite-lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets	875	858
Management contract
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	1,900	1,900
Total accumulated amortization	(143)	(48)
Net carrying value, Finite-lived intangible assets	1,757	1,852
Enterprise resource planning system
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	5,187	2,246
Total accumulated amortization	(437)	(67)
Net carrying value, Finite-lived intangible assets	4,750	2,179
Finite-lived intangible assets placed into service during period	$ 2,600	1,100
Estimated useful life	7 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross carrying value, Finite-lived intangible assets	$ 3,346	3,027
Total accumulated amortization	(2,320)	(1,813)
Net carrying value, Finite-lived intangible assets	$ 1,026	$ 1,214