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The components of the net deferred income tax asset as of December 31, 2020, 2019, and 2018 are as follows: (Details) - USD ($) | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Deferred Income Tax Assets: |  |  |
Net operating losses | $ 195,008,131 | $ 157,555,975 | $ 126,419,113
Share based compensation | 17,251,900 | 13,913,568 | 11,640,464
Interest expense limitation | 12,991,716 | 5,389,129 | 1,173,614
Other, net | 4,818,935 | 3,662,037 | 1,658,573
R&D credit | 186,347 | 186,347 | 186,347
Total deferred income tax asset | 230,257,029 | 180,707,056 | 141,078,111
Valuation allowance | (230,257,029) | (180,707,056) | (141,078,111)
Deferred income tax assets, net | $ 0 | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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