Significant Accounting Policies (Details 4) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Significant Accounting Policies
Cash and cash equivalents at end of period	$ 22,300	$ 23,465
Restricted cash at end of period	30	25
Cash and cash equivalents and restricted cash at end of period	$ 22,330	$ 23,490