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We follow ASC Topic 718, Share-Based Payments, in which compensation expense is recognized only for share-based payments expected to vest. (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition 2 years 8 months 12 days  
Share-Based Payment Arrangement, Option [Member]    
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]    
Share-based compensation expense $ 148 $ 42
Remaining unrecognized compensation expense $ 1,567