Intangible assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Intangible Assets [Abstract]
Amortization of Intangible Assets	$ 1,300	$ 900
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 1,495