Income Taxes - Reconciliation of Effective Tax Rate (Details)	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
U.S. federal taxes at statutory rate	21.00%	21.00%	21.00%
State taxes (net of federal benefit)	10.50%	2.10%	3.50%
Research and development tax credits	0.70%	0.60%	3.40%
Non-deductible stock-based compensation	(11.30%)	(7.80%)	(3.30%)
162(m) Limitation	(0.057)	0	0
Permanent Items	(0.20%)	0.00%	(0.50%)
Unrealized fair market value gain on warrants	17.00%	0.00%	0.00%
Change in valuation allowance	(32.00%)	(15.90%)	(24.10%)
Effective tax rate	0.00%	0.00%	0.00%

Effective Income Tax Rate Reconciliation, Nondeductible Expense, Pay For Covered Employees Limitation, Percent

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Effective Income Tax Rate Reconciliation Unrealized Fair Market Value Gain On Warrants

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

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to state and local income tax expense (benefit), net of federal tax expense (benefit).

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