Stock-Based Compensation - Stock Option Activity Under Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Number of Shares
Beginning Balance	10,408,622
Granted	3,065,168	2,690,000
Cancelled	(160,544)
Ending Balance	13,313,246		10,408,622
Options exercisable, at end of period	4,553,574		3,891,598
Options available for future grant	12,555,464
Weighted Average Exercise Price
Beginning Balance	$ 1.84
Granted	0.52
Cancelled	1.90
Ending Balance	1.54		$ 1.84
Options exercisable, at end of period	$ 2.31		$ 2.46
Weighted Average Contractual Term (Years)
Outstanding, at end of period	8 years 9 months 18 days
Options exercisable, at end of period	7 years 11 months 26 days		8 years 29 days
Aggregate Intrinsic Value
Outstanding, at end of period	$ 364
Options exercisable, at end of period	$ 0		$ 0