Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Statutory U.S. Federal Income Tax Rate to Effective Tax Rate (Details)

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Income Taxes - Reconciliation of Statutory U.S. Federal Income Tax Rate to Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
U.S. federal statutory income tax rate 21.00% 21.00%
Foreign tax rate differential (0.20%) (4.20%)
State taxes, net of federal benefit 5.70% 3.70%
Nondeductible expenses (5.80%)  
Change in valuation allowance (20.70%) (20.50%)