Leases - Lease costs and other lease information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease costs
Operating lease cost	$ 2,378
Variable lease cost	819
Short-term lease cost	535
Finance lease cost
Interest on lease liabilities	58
Amortization of right-of-use assets	116
Sublease Income	(270)
Net lease cost	3,636
Operating cash flows from operating leases	$ 2,376