Stock-Based Compensation - Summary of Stock Plan Activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Granted	0
2018 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning Balance	10,457,000	1,567,000
Number of options Retroactive application of Exchange Ratio		5,529,000
Number of options, as adjusted		7,096,000
Number of Options, Granted		5,046,000
Number of Options, Cancelled		(1,685,000)
Number of Options, Ending Balance	10,457,000	10,457,000	1,567,000
Vested options as of December 31, 2021	8,117
Weighted-Average Exercise Price, Beginning Balance	$ 0.51	$ 2.30
Weighted-Average Exercise Price, as adjusted		0.47
Weighted-Average Exercise Price, Ending Balance	0.51	$ 0.51	$ 2.30
Weighted-Average Exercise Price, Vested options as of December 31, 2021	$ 0.48
Weighted Average Remaining Contractual Life (Years), Balance	7 years 11 months 15 days	8 years 11 months 15 days	9 years 7 months 20 days
Weighted Average Remaining Contractual Life (Years), Vested options as of December 31, 2021	7 years 9 months 3 days