Shareholders' Equity - Additional paid-in capital (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Additional paid-in capital
Beginning balance	$ 86,659	$ 139,594	$ 112,600	$ 143,119
Share-based compensation expense	2,380		6,905	5,304
Exercise of stock options	28	24	217	43
Ending balance	77,155	127,417	77,155	127,417
Additional paid-in capital
Additional paid-in capital
Beginning balance	20,090	11,795	15,711	8,530
Share-based compensation expense	2,380	2,024	6,905	5,304
Exercise of stock options	(29)	(26)	(175)	(41)
Ending balance	$ 22,441	$ 13,793	$ 22,441	$ 13,793

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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+ Details