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Income Taxes - Summary of Principal Components of Company's Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets: |  |
Federal, state and local net operating loss carryforwards | $ 15,241 | $ 5,688
License fee deductions | 340 | 362
Research and development tax credits | 1,317 | 452
Stock-based compensation deductions | 1,243 | 264
Accrued expenses | 837 | 457
Gross deferred tax assets | 18,978 | 7,223
Less: valuation allowance | (18,978) | (7,223)
Deferred tax liabilities: |  |
Net deferred tax assets | $ 0 | $ 0

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