Cash, cash equivalents, and Restricted cash (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
Cash and cash equivalents	$ 83,602	$ 86,147	$ 76,192	$ 69,928
Restricted Cash and Cash Equivalents, Current	0	0	4,446	18,846
Restricted cash - noncurrent	75	75	75	75
Total cash, cash equivalents and restricted cash shown in the condensed consolidated statements of cash flows	$ 83,677	$ 86,222	$ 80,713	$ 88,849