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INCOME TAXES | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020
INCOME TAXES |  |
INCOME TAXES | 12. INCOME TAXES The Company did not record a provision or benefit for income taxes during the three months ended March 31, 2021 and 2020. The Company continues to maintain a full valuation allowance for its net U.S. federal and state deferred tax assets. | 17.INCOME TAXES The components of loss before provision for income taxes for the years ended December 31, 2020 and 2019 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31,
​ |  | 2020 |  | 2019
Domestic | ​ | $ | (156,124) | ​ | $ | (59,408)
Foreign | ​ |  | — | ​ |  | —
Loss before income taxes | ​ | $ | (156,124) | ​ | $ | (59,408)
​ The components of the provision for income tax expense for the years ended December 31, 2020 and 2019 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 |  | 2019
Current: |  | ​ |  |  | ​ |
Federal | ​ | $ | — | ​ | $ | —
State | ​ |  | 5 | ​ |  | 6
Total current | ​ |  | 5 | ​ |  | 6
Deferred: | ​ |  |  | ​ |  |
Federal | ​ |  | — | ​ |  | —
State | ​ |  | — | ​ |  | —
Total deferred | ​ |  | — | ​ |  | —
Total provision for income taxes | ​ | $ | 5 | ​ | $ | 6
​ The effective tax rate of the Company’s provision (benefit) for income taxes differs from the federal statutory rate as follows: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, |
​ |  | 2020 | 2019 |
Statutory rate |  | 21.00 | % | 21.00 | %
State tax |  | 3.19 | % | 7.13 | %
Foreign income and withholding taxes |  | 0.41 | % | 0.08 | %
Stock-based compensation |  | (0.60) | % | (0.51) | %
Change in fair value of warrants |  | (11.36) | % | 0.53 | %
Other |  | — |  | (0.04) | %
Non-deductible interest expense |  | (1.51) | % | (2.63) | %
Valuation allowance |  | (11.13) | % | (25.56) | %
Total |  | 0.00 | % | 0.00 | %
​ Due to the Company’s net losses, there were no provisions for federal income taxes for 2020 and 2019. Deferred income taxes arise from temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax reporting purposes, as well as net operating losses (“NOLs”) and tax credit carryforwards. Significant components of the Company’s deferred tax assets and liabilities as of December 31, 2020 and 2019 are as follows (in thousands):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31,
​ | ​ | 2020 |  | 2019
Deferred tax assets: |  | ​ |  |  | ​ |
Net operating losses | ​ | $ | 59,960 | ​ | $ | 50,821
Tax credits | ​ |  | 761 | ​ |  | 761
Depreciable assets | ​ |  | 635 | ​ |  | 189
Intangible assets | ​ |  | — | ​ |  | 431
Accruals and allowances | ​ |  | 575 | ​ |  | 1,317
Stock-based compensation | ​ |  | 83 | ​ |  | 62
Deferred revenue | ​ |  | 27,962 | ​ |  | 19,370
Other | ​ |  | 3,035 | ​ |  | 2,004
Total gross deferred tax assets | ​ |  | 93,011 | ​ |  | 74,955
Less: Valuation allowance | ​ |  | (91,315) | ​ |  | (73,930)
Net deferred tax assets | ​ |  | 1,696 | ​ |  | 1,025
Deferred tax liabilities: | ​ |  |  | ​ |  |
Amortization of asset retirement obligation | ​ |  | (1,696) | ​ |  | (1,025)
Total gross deferred tax liabilities | ​ |  | (1,696) | ​ |  | (1,025)
Net deferred taxes | ​ | $ | — | ​ | $ | —
​ As of December 31, 2020 and 2019, the Company had federal NOL carryforwards of approximately $199.8 million and $171.2 million, respectively, and state NOL carryforwards of approximately $200.5 million and $171.0 million, respectively. The federal and state NOL carryforwards will both begin to expire in 2029. As of December 31, 2020 and 2019, the Company had federal research and development tax credit carryforwards of $0.7 million and $1.0 million, respectively, which begin to expire in 2029 if not utilized. As of December 31, 2020 and 2019, the Company had California research and development tax credit carryforwards of $0.7 million and $1.0 million, respectively, which do not expire. As of December 31, 2020 and 2019, the Company had California Enterprise Zone tax credits of $0.1 million and $0.1 million, respectively, which begin to expire in 2021. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. As a result of a history of taxable losses and uncertainties as to future profitability, the Company recorded a full valuation allowance against its deferred tax assets. The valuation allowance was $91.3 million and $73.9 million as of December 31, 2020 and 2019, respectively. Utilization of the NOL carryforwards and tax credit forwards may be subject to a substantial annual limitation due to ownership change limitations that may have occurred or that could occur in the future, as required by the Internal Revenue Code Section 382, as well as similar state provisions. In general, an “ownership change,” as defined by the code, results from a transaction or series of transactions over a three- year period resulting in an ownership change of more than 50 percentage points of the outstanding stock of a company by certain stockholders or public groups. Any limitation may result in expiration of all or a portion of the NOL or tax credit carryforwards before utilization. The Company has not performed a detailed analysis to determine whether an ownership change under Section 382 of the Code has previously occurred. As a result, the Company’s ability to utilize existing carryforwards could be restricted. The Company had gross unrecognized tax benefits of $0.8 million as of December 31, 2020 and 2019. There were no material additions, reductions or settlements of unrecognized tax benefits for years ended December 31, 2020 and 2019. The Company expects resolution of unrecognized tax benefits, if created, would occur while the full valuation allowance of deferred tax assets is maintained. The Company does not expect to have any unrecognized tax benefits that, if recognized, would affect the effective tax rate. As of December 31, 2020, the Company does not have a liability for potential penalties or interest. The Company does not expect its unrecognized tax benefits to change significantly over the next 12 months. In the normal course of business, the Company is subject to examination by taxing authorities throughout the United States of America. The Company is not currently under audit by the Internal Revenue Service or similar state or local authorities. The tax return years 2016 through 2020 remain open to examination by the major domestic taxing jurisdictions to which the Company is subject. Net operating losses generated on a tax return basis by the Company for calendar years 2009 through 2020 remain open to examination by the major domestic taxing jurisdictions.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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