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Income Taxes - Reconciliation of income tax provision (benefit) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Federal and state provision (benefit) for income taxes
Federal provision (benefit) for income taxes	$ 0	$ 0
State provision (benefit) for income taxes	$ 0	$ 0
Reconciliation of income tax benefit computed at the statutory federal income tax rate to income taxes as reflected in the financial statements
Federal income tax benefits at statutory rate	21.00%	21.00%
State and local tax, net of federal benefit	13.70%	7.60%
Permanent differences	0.10%	(0.80%)
Research and development credit	2.40%	1.90%
Stock-based compensation	15.70%
Change in valuation allowance	(52.90%)	(29.70%)
Effective income tax rate	0.00%	0.00%

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- Definition

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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