Shareholders' Equity - Additional paid-in capital (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Additional paid-in capital
Beginning balance	$ 143,119	$ 114,917
Share-based compensation expense	7,279	4,945
Exercise of stock options	121	300
Ending balance	112,600	143,119
Additional paid-in capital
Additional paid-in capital
Beginning balance	8,530	3,805
Share-based compensation expense	7,279	4,945
Exercise of stock options	(98)	(220)
Ending balance	$ 15,711	$ 8,530

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