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Income Taxes | 12 Months Ended
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Dec. 31, 2021
Income Tax Disclosure [Abstract] |
Income Taxes | 11. Income Taxes During the years ended December 31, 2021 and 2020, the Company recorded no income tax benefits for the net operating losses incurred in each year or interim period due to its uncertainty of realizing a benefit from those items. The domestic and foreign components of loss before income taxes were as follows (in thousands):
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Domestic |  | $ | (89,565 | ) |  | $ | (77,671 | )
Foreign |  |  | (191 | ) |  |  | (609 | )
Loss before income taxes |  | $ | (89,756 | ) |  | $ | (78,280 | )
A reconciliation of the U.S. federal statutory income tax rate to the Company’s effective income tax rate is as follows:
|  | Year Ended December 31, |
|  | 2021 |  |  | 2020 |
Federal statutory income tax rate |  |  | (21.0 | ) |  |  | (21.0 | )
Federal and state research and development tax credit |  |  | (3.1 | ) |  |  | (3.2 | )
State taxes, net of federal benefit |  |  | (7.0 | ) |  |  | (6.2 | )
Foreign rate differential |  |  | - |  |  |  | - |
Nondeductible items |  |  | 0.6 |  |  |  | 0.9 |
Increase in deferred tax asset valuation allowance |  |  | 30.5 |  |  |  | 29.5 |
Effective income tax rate |  |  | — |  |  |  | — |
Net deferred tax assets as of December 31, 2021 and 2020 consisted of the following (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Net operating loss carryforwards |  | $ | 83,849 |  |  | $ | 63,612 |
Research and development tax credit carryforwards |  |  | 12,375 |  |  |  | 8,024 |
Other |  |  | 6,220 |  |  |  | 3,403 |
Total deferred tax assets |  |  | 102,444 |  |  |  | 75,039 |
Valuation allowance |  |  | (102,444 | ) |  |  | (75,039 | )
Net deferred tax assets |  | $ | — |  |  | $ | — |
As of December 31, 2021, the Company had U.S. federal and state net operating loss carryforwards of $303.7 million and $302.6 million, respectively, which may be available to offset future income tax liabilities. The federal NOLs of $73.0 million will expire at various dates from 2033 to 2037 and approximately $230.7 million can be carried forward indefinitely. The state NOLs begin to expire in 2033 and will expire at various dates through 2039. In addition, as of December 31, 2021, the Company had foreign net operating loss carryforwards of $4.4 million, which may be available to offset future income tax liabilities and do not expire. As of December 31, 2021, the Company also had federal and state research and development tax credit carryforwards of $10.2 million and $2.2 million, respectively, which may be available to offset future income tax liabilities and begin to expire in 2033 and 2028, respectively. Utilization of the U.S. net operating loss carryforwards and research and development tax credit carryforwards may be subject to a substantial annual limitation under Section 382 of the Internal Revenue Code of 1986, and corresponding provisions of state law, due to ownership changes that have occurred previously or that could occur in the future. These ownership changes may limit the amount of carryforwards that can be utilized annually to offset future taxable income. In general, an ownership change, as defined by Section 382, results from transactions increasing the ownership of certain stockholders or public groups in the stock of a corporation by more than 50% over a three-year period. The Company has not conducted a study to assess whether a change of control has occurred or whether there have been multiple changes of control since inception due to the significant complexity and cost associated with such a study. If the Company has experienced a change of control, as defined by Section 382, at any time since inception, utilization of the net operating loss carryforwards or research and development tax credit carryforwards would be subject to an annual limitation under Section 382, which is determined by first multiplying the value of the Company’s stock at the time of the ownership change by the applicable long-term tax-exempt rate, and then could be subject to additional adjustments, as required. Any limitation may result in expiration of a portion of the net operating loss carryforwards or research and development tax credit carryforwards before utilization. Further, until a study is completed by the Company and any limitation is known, no amounts are being presented as an uncertain tax position. The Company has evaluated the positive and negative evidence bearing upon its ability to realize the deferred tax assets. Management has considered the Company’s history of cumulative net losses incurred since inception and its lack of commercialization of any products or generation of any revenue from product sales since inception and has concluded that it is more likely than not that the Company will not realize the benefits of the deferred tax assets. Accordingly, a full valuation allowance has been established against the deferred tax assets as of December 31, 2021 and 2020. Management reevaluates the positive and negative evidence at each reporting period. Changes in the valuation allowance for deferred tax assets during the years ended December 31, 2021 and 2020 related primarily to the increase in net operating loss carryforwards and research and development tax credit carryforwards, and were as follows (in thousands):
|  | December 31, |
|  | 2021 |  |  | 2020 |
Valuation allowance as of beginning of year |  | $ | (75,039 | ) |  | $ | (51,980 | )
Decreases recorded as benefit to income tax provision |  |  | — |  |  |  | — |
Increases recorded to income tax provision |  |  | (27,405 | ) |  |  | (23,059 | )
Valuation allowance as of end of year |  | $ | (102,444 | ) |  | $ | (75,039 | )
The Company has no t recorded any amounts for unrecognized tax benefits as of December 31, 2021 or 2020. The Company’s policy is to record interest and penalties related to income taxes as part of its income tax provision. As of December 31, 2021 or 2020, the Company had no accrued interest or penalties related to uncertain tax positions and no amounts had been recognized in the Company’s statement of operations and comprehensive loss. The Company has not, as yet, conducted a study of its research and development credit carryforwards. This study may result in an adjustment to the Company’s research and development credit carryforwards; however, until a study is completed and any adjustment is known, no amounts are being presented as an uncertain tax position. A full valuation allowance has been provided against the Company’s research and development credits and, if an adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. The Company had filed separate U.S. income tax returns return for each of its subsidiaries prior to its reorganization in 2015. The Company now files U.S. income tax returns as a U.S. consolidated group. In Massachusetts, the Company files income tax returns as a combined group except for its Massachusetts Securities Corporation subsidiary, which is a separate income tax filing. The statute of limitations for assessment by the Internal Revenue Service and Massachusetts tax authorities remains open for all years since 2018. To the extent the Company has tax attribute carryforwards, the tax years in which the attribute was generated may still be adjusted upon examination by the Internal Revenue Service or state authorities to the extent utilized in a future period. No federal or state tax audits are currently in process. In response to the COVID-19 pandemic, the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”), was signed into law in the United States in March 2020. The CARES Act adjusted a number of provisions of the tax code, including the calculation and eligibility of certain deductions and the treatment of net operating losses and tax credits. The enactment of the CARES Act did not result in any material adjustments to the Company’s income tax provision for the year ended December 31, 2021, or to the Company’s net deferred tax assets as of December 31, 2021.

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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=121826272&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=122134291&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=121826272&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=122134291&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=121826272&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 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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