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Equity Incentive Plans (Narrative) (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2024
USD ($)
$ / shares
shares
Shares available for future grants under the 2016 Plan | shares 2,362,677
Employee Stock Option [Member]  
Common stock closing price | $ / shares $ 4.18
Unrecognized compensation cost related to unvested options | $ $ 5.9
Stock Options And Restricted Stock Awards [Member]  
Weighted-average remaining period for recognition of compensation costs related to unvested options 2 years