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Income Taxes
 12 Months Ended
Dec. 31, 2020
Income Tax Disclosure [Abstract]  
Income Taxes Income TaxesThe (provision for) benefit from income taxes for the years ended December 31, 2020 and 2019, consists of the following (in thousands):
 20202019
Current benefit (provision):  
Federal benefit (expense)$15,587 $86 
State (expense) benefit(149)(55)
Total current benefit (provision)15,438 31 
Deferred benefit (provision):  
Federal benefit (expense)(10,234)662 
State(412)— 
Total deferred benefit (expense)(10,646)662 
Total benefit (provision)$4,792 $693 

The effective tax rate for the years ended December 31, 2020 and 2019, differs from the statutory rate as follows:

 20202019
Statutory rate21.0 %21.0 %
State and local taxes(17.0)%(3.7)%
Uncertain tax position— %— %
Goodwill impairment — %(13.7)%
Research and development credit— %1.4 %
Stock based compensation(13.1)%(0.8)%
Nondeductible compensation(11.6)%(0.3)%
Effect of CARES Act180.3 %— %
Other0.5 %0.9 %
Effective rate160.1 %4.8 %
Deferred re-measurement for rate change— %— %
Effective rate160.1 %4.8 %

On March 27, 2020, the Coronavirus Aid, Relief, and Economic Security Act ("CARES Act") was enacted in response to the economic impact caused by the COVID-19 pandemic. The CARES Act, among other things, permits federal income tax net operating loss ("NOL") carryovers and carrybacks to offset 100% of taxable income for taxable years beginning before 2021. In addition, the CARES Act allows NOLs incurred in 2018, 2019, and 2020 to be carried back to each of the five preceding taxable years to generate a refund of previously paid federal income taxes. The Company generated significant NOLs during 2018 and 2019 and filed carryback claims for these losses to the preceding five years. Accordingly, as of March 31, 2020, the Company recorded a federal income tax receivable of $15.0 million and an increase to its deferred tax liability of $10.1 million on its condensed balance sheet. During the third quarter of 2020, the Company received refunds corresponding to the 2018 NOL carryback, leaving a balance in the federal income tax receivable of $11.5 million at December 31, 2020.
The income tax effects of temporary differences that give rise to significant portions of deferred income tax assets and (liabilities) as of December 31, 2020 and 2019, are as follows (in thousands):

 20202019
Deferred income tax assets:  
Net operating loss$3,361 $1,519 
Research and development credits1,363 161 
Stock compensation175 580 
Deferred compensation705 389 
Other398 160 
Total deferred income tax assets6,002 2,809 
Deferred income tax liabilities:  
Property and equipment(47,626)(33,761)
Goodwill and other intangible assets(266)(291)
Total deferred income tax liabilities(47,892)(34,052)
Net deferred income tax liabilities$(41,890)$(31,243)

As of December 31, 2020, the Company had NOL carryforwards for federal income tax purposes of $11.6 million, which may be carried forward indefinitely and can offset up to 80% of future taxable income in any given year. Future changes in ownership, as defined by Section 382 of the Internal Revenue Code, could limit the amount of NOL carryforwards used in any one year. In general, under Section 382 and 383 of the IRC, a corporation that undergoes an “ownership change” is subject to limitations on its ability to utilize its pre-change NOLs and certain tax credits, to offset future taxable income and tax. In general, an ownership change occurs if the aggregate stock ownership of certain stockholders changes by more than 50 percentage points over such stockholders’ lowest percentage of ownership during the testing period (generally three years).

We account for uncertain tax positions in accordance with guidance in FASB ASC 740, which prescribes the minimum recognition threshold a tax position taken or expected to be taken in a tax return is required to meet before being recognized in the financial statements. The Company assessed whether it had any uncertain tax positions related to open tax years and concluded there were none. Accordingly, no reserve for uncertain tax positions has been recorded as of December 31, 2020 and 2019.

Our policy regarding income tax interest and penalties is to expense those items as incurred. During the years ended December 31, 2020 and 2019, there were no significant income tax interest or penalty items in the statement of income.
We file income tax returns in the U.S. federal jurisdiction and various state jurisdictions. With few exceptions, we are no longer subject to U.S. federal or state income tax examination by tax authorities for years before 2015.