Quarterly report pursuant to Section 13 or 15(d)

Income taxes

Income taxes
3 Months Ended
Mar. 31, 2021
Income Tax Disclosure [Abstract]  
Income taxes Income taxesFor the three months ended March 31, 2021, and March 31, 2020, the Company recorded no income tax expense. For the three months ended March 31, 2021 and March 31, 2020, the Company’s effective tax rate was 0%. The Company’s effective tax rate of 0% differs from the United States federal statutory rate of 21% primarily because the Company’s losses have been fully offset by a valuation allowance due to uncertainty of realizing the tax benefit of net operating losses ("NOLs”) for the three months ended March 31, 2021, and year ended December 31, 2020.
The Company’s deferred tax assets attributed to net operating loss carryforwards begin to expire in 2027. The ultimate realization of deferred taxes is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. On the basis of management’s assessment, a valuation allowance equal to the net deferred tax assets was recorded since it is more likely than not that the deferred tax assets will not be realized.
The Company has no accrued interest and penalties related to uncertain income tax positions. We do not anticipate that the amount of unrecognized tax benefits will significantly increase or decrease within the next twelve months. As of March 31, 2021 and December 31, 2020, the Company did not have any significant uncertain tax positions.
The Company’s income tax returns generally remain open for examination for three years from the date filed with each taxing jurisdiction.