Stock-Based Compensation - Stock Option Activity Under Stock Option Plan (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Number of Shares
Beginning Balance			10,665,869
Granted	1,275,000	2,755,000	4,667,500	7,150,438
Exercised			(26,250)
Cancelled			(4,683,904)
Ending Balance	10,623,215		10,623,215		10,665,869
Options exercisable, at end of period	3,211,631		3,211,631		4,410,312
Options available for future grant	15,245,494		15,245,494
Weighted Average Exercise Price
Beginning Balance			$ 2.87
Granted			1.08
Exercised			0.80
Cancelled			3.40
Ending Balance	$ 1.85		1.85		$ 2.87
Options exercisable, at end of period	$ 2.69		$ 2.69		$ 3.85
Weighted Average Contractual Term (Years)
Outstanding, at end of period			8 years 3 months 7 days
Options exercisable, at end of period			7 years 3 days		7 years 6 months 10 days
Aggregate Intrinsic Value
Outstanding, at end of period	$ 3,572		$ 3,572
Options exercisable, at end of period	$ 510		$ 510		$ 0