Stock-Based Compensation - Summary of Stock Plan Activity (Details) - 2018 Stock Plan - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Beginning Balance	10,457,000
Number of Options, Granted	175,000
Number of Options, Exercised	131
Number of Options, Cancelled and forfeited	326,000
Number of Options, Ending Balance	10,175	10,457,000
Vested options as of December 31, 2021	8,022
Weighted-Average Exercise Price, Beginning Balance	$ 0.51
Weighted-Average Exercise Price, Granted	9.58
Weighted-Average Exercise Price, Exercised	0.47
Weighted-Average Exercise Price, Cancelled and forfeited	0.47
Weighted-Average Exercise Price, Ending Balance	0.66	$ 0.51
Weighted-Average Exercise Price, Vested options as of December 31, 2021	$ 0.49
Weighted Average Remaining Contractual Life (Years), Balance	7 years 9 months	7 years 11 months 15 days
Weighted Average Remaining Contractual Life (Years), Vested options as of December 31, 2021	7 years 6 months 10 days