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Income Taxes - Reconciliation of Statutory and Effective Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Reconciliation of the statutory tax rate to the Company's effective tax rate |  |
Income at US Statutory Rate | 21.00% | 21.00%
State Taxes, net of Federal benefit | 6.97% | 6.79%
Permanent Differences | (1.09%) | (0.33%)
Tax Credits | 5.98% | 3.30%
Tax Law change | (0.04%) | 0.00%
Foreign Rate Differential | (0.46%) | 0.07%
Israel DTA write-off | (70.15%) | 0.00%
Valuation Allowance | 36.56% | (40.18%)
Other | 1.23% | 9.35%
Effective income tax rate | 0.00% | 0.00%

X
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