Earnings per share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share
Net loss	$ 3,478	$ 3,174
Basic and diluted income (loss) per share	$ 0.27	$ (0.25)
Basic and Diluted
Weighted average number of shares of common stock outstanding and potential dilutive shares of common stock	12,693,514	12,693,514