Equity Incentive Plans (Summary of Stock Option Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Equity Incentive Plans
Shares, Balance Beginning	3,165,216
Shares, Granted	1,784,054
Shares, Exercised	(13,407)
Shares, Forfeited/Cancelled	(61,243)
Shares, Balance Ending	4,874,620	3,165,216
Vested and expected to vest at March 31, 2024	4,874,620
Exercisable at March 31, 2024	2,204,014
Weighted Average Exercise Price, Outstanding Beginning	$ 5.04
Weighted Average Exercise Price, Granted	3.38
Weighted Average Exercise Price, Exercised	3.15
Weighted Average Exercise Price, Forfeited/Cancelled	5.06
Weighted Average Exercise Price, Outstanding Ending	4.44	$ 5.04
Weighted Average Exercise Price, Vested and expected to vest at March 31, 2024	4.44
Weighted Average Exercise Price, Exercisable at March 31, 2024	$ 5.51
Weighted Average Remaining Contractual Term (Years), Outstanding	7 years 2 months 12 days	5 years 10 months 24 days
Weighted Average Remaining Contractual Term (Years), Vested and expected to vest at March 31, 2024	7 years 2 months 12 days
Weighted Average Remaining Contractual Term (Years), Exercisable at March 31, 2024	4 years 8 months 12 days
Aggregate Intrinsic Value, Outstanding Beginning	$ 429
Aggregate Intrinsic Value, Exercised	15
Aggregate Intrinsic Value, Outstanding Ending	3,334	$ 429
Aggregate Intrinsic Value, Vested and expected to vest at March 31, 2024	3,334
Aggregate Intrinsic Value, Exercisable at March 31, 2024	$ 1,243