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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
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Remaining weighted average-period, expense recognition (years) 2 years 10 months 25 days  
Share-based Payment Arrangement, Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 160 $ 195
Remaining unrecognized compensation expense  $ 1,581