Net Loss Per Share - Schedule of computation of loss per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2024	Sep. 30, 2023
Numerator:
Net Income (Loss)	$ (26,938)	$ (45,718)	$ (32,157)	$ (20,997)	$ (17,040)	$ (16,843)	$ (104,813)	$ (54,880)
Induced conversion of redeemable preferred stock	0			0			(46,014)	0
Net loss attributable to common stockholders	$ (26,938)			$ (20,997)			$ (150,827)	$ (54,880)
Denominator:
Weighted-average shares outstanding during the period, basic	371,538			79,152			346,093	78,967
Weighted-average shares outstanding during the period, diluted	371,538			79,152			346,093	78,967
Net loss per share attributable to common stockholders, basic	$ (0.07)			$ (0.27)			$ (0.44)	$ (0.69)
Net loss per share attributable to common stockholders, diluted	$ (0.07)			$ (0.27)			$ (0.44)	$ (0.69)