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Shareholders' Equity (Options Vested or are Expected to Vest as of December 31, 2020) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
shares
Stockholders' Equity Note [Abstract]  
Vested, number of shares | shares 458,650
Expected to vest, number of shares | shares 244,024
Total, number of shares | shares 702,674
Vested, weighted average exercise price | $ / shares $ 2.70
Expected to vest, weighted average exercise price | $ / shares 2.22
Total, weighted average exercise price | $ / shares $ 2.54
Vested, weighted average remaining contractual term 1 year 3 months 18 days
Expected to vest, weighted average remaining contractual term 5 years 7 months 20 days
Total, weighted average remaining contractual term 2 years 9 months 21 days
Vested, aggregate intrinsic value | $ $ 131
Expected to vest, aggregate intrinsic value | $ 180
Total, aggregate intrinsic value | $ $ 311