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Income Taxes - Summary of Principal Components of Company's Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Federal, state and local net operating loss carryforwards | $ 5,688 | $ 1,163
License fee deductions | 362 | 328
Research and development tax credits | 452 | 69
Stock-based compensation deductions | 264 | 17
Accrued expenses | 457 | 35
Gross deferred tax assets | 7,223 | 1,612
Less: valuation allowance | (7,223) | (1,612)
Deferred tax liabilities: |  |
Net deferred tax assets | $ 0 | $ 0

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