Leases (Supplemental balance sheet information related to leases) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Assets
Operating ROU assets	$ 1,977	$ 614
Finance ROU assets	6,797	10,045
Current liabilities:
Operating lease liability	3,380	5,718
Finance lease liability	$ 3,738	$ 3,488
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Accrued expenses and other current liabilities (Note 7)	Accrued expenses and other current liabilities (Note 7)
Non-current liabilities:
Operating lease liability	$ 2,733	$ 7,180
Finance lease liability	$ 2,780	$ 6,176
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other liabilities	Other liabilities