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A summary of the weighted-average grant-date fair value of options, total intrinsic value of options exercised, and cash receipts from options exercised is shown below: (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Share-based Payment Arrangement [Abstract]    
Weighted-average fair value of options granted (per share) $ 0.97 $ 0.49
Intrinsic value gain of options exercised $ 137
Cash receipts from exercise of options $ 58