Consolidated Statements of Operations and Comprehensive Loss - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Revenues:
Total revenues	$ 0	$ 700
Cost and expenses:
Cost of revenues	0	11,944
Research and development	27,797	20,839
Sales and marketing	0	12,019
General and administrative	15,777	13,955
Total cost and expenses	43,574	58,757
Loss from operations	(43,574)	(58,057)
Other income (expense):
Interest income (expense), net	1,364	(448)
Total other income (expense)	1,364	(448)
Loss from operations, before income taxes	(42,210)	(58,505)
Income tax benefit	0	0
Net loss	(42,210)	(58,505)
Comprehensive loss	$ (42,210)	$ (58,505)
Net loss per share:
Basic and diluted net loss per share (in dollars per share)	$ (0.88)	$ (1.72)
Weighted average shares used to compute net loss per common share — basic and diluted (in shares)	48,038	33,935