Investments (Details) $ in Thousands	3 Months Ended		12 Months Ended	15 Months Ended
	Mar. 31, 2024 USD ($) item	Mar. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) item	Mar. 31, 2024 USD ($) item	Dec. 31, 2022 USD ($)
Schedule of Investments [Line Items]
Cash, cash equivalents & restricted cash, Amortized Cost	$ 81,316		$ 77,909	$ 81,316
Total cash, cash equivalents, restricted cash and investments, Gross Unrealized Gains					$ 13
Total cash, cash equivalents, restricted cash and investments, Gross Unrealized Losses	(4)			(4)	(1)
Total cash, cash equivalents, restricted cash and investments, Fair Value	110,100			110,100
Accrued interest receivable	100			$ 100
Realized gains or losses on investments	$ 0	$ 0
Number of investments in unrealized loss position | item	8		2	8
Number of investments in unrealized loss position for more than 12 months | item	0			0
Unrealized loss of available-for-sale securities with unrealized losses for less than 12 months	$ 28,809		$ 8,896	$ 28,809
Amortized Cost
Schedule of Investments [Line Items]
Total cash, cash equivalents, restricted cash and investments, Amortized Cost	111,407		138,284	111,407
Total
Schedule of Investments [Line Items]
Total cash, cash equivalents, restricted cash and investments, Fair Value	$ 111,403		$ 138,296	$ 111,403
Corporate bonds, agency bonds and commercial paper (due within 1 year)
Schedule of Investments [Line Items]
Maturity period, investments	1 year		1 year	1 year
Gross Unrealized Gains					13
Gross Unrealized Losses	$ (4)			$ (4)	(1)
Fair value of available-for-sale securities with unrealized losses for less than 12 months	28,809		$ 8,896	28,809
Unrealized loss of available-for-sale securities with unrealized losses for less than 12 months	4		1	4
Corporate bonds, agency bonds and commercial paper (due within 1 year) | Amortized Cost
Schedule of Investments [Line Items]
Due within 1 year, Amortized Cost	28,813		59,208	28,813
Corporate bonds, agency bonds and commercial paper (due within 1 year) | Total
Schedule of Investments [Line Items]
Due within 1 year, Fair Value	28,809		59,220	28,809
Investments.
Schedule of Investments [Line Items]
Gross Unrealized Gains					13
Gross Unrealized Losses	(4)			(4)	$ (1)
Investments. | Amortized Cost
Schedule of Investments [Line Items]
Investments, Amortized Cost	28,813		59,208	28,813
Investments. | Total
Schedule of Investments [Line Items]
Investments, Fair Value	28,809		59,220	28,809
Cash and money market accounts. | Amortized Cost
Schedule of Investments [Line Items]
Cash, cash equivalents & restricted cash, Amortized Cost	82,594		79,076	82,594
Cash and money market accounts. | Total
Schedule of Investments [Line Items]
Cash, cash equivalents & restricted cash, Fair Value	82,594		79,076	82,594
Cash, cash equivalents & restricted cash | Amortized Cost
Schedule of Investments [Line Items]
Cash, cash equivalents & restricted cash, Amortized Cost			79,076
Total cash, cash equivalents, restricted cash and investments, Amortized Cost	82,594			82,594
Cash, cash equivalents & restricted cash | Total
Schedule of Investments [Line Items]
Cash, cash equivalents & restricted cash, Fair Value			$ 79,076
Total cash, cash equivalents, restricted cash and investments, Fair Value	$ 82,594			$ 82,594