Leases - Supplemental cash flow information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 685	$ 718
Right-of-use assets obtained in exchange for lease obligations:
Operating leases	$ 212	$ 97