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Income Taxes - Summary of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Net operating loss carryforwards | $ 5,087 | $ 8,442
Net research and development expenditures | 7,478 | 4,195
Share issuance costs | 4,506 | 78
Net federal investment tax credits | 3,181 | 1,877
U.S. research and development tax credits | 961 |
Tax basis of property and equipment in excess of carrying values | (86) | (204)
Operating lease right-of-use assets | (1,240) | (279)
Operating lease liability | 1,063 | 287
Accrued expense and other liabilities | 345 | 161
Deferred revenue | 15,372 |
Share-based compensation | 103 |
Total deferred tax assets | 36,770 | 14,557
Valuation allowance | (35,358) | (14,425)
Net deferred tax assets | $ 1,412 | $ 132

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