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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
Income Taxes [Line Items] |  |  |  |
Effective tax rate | (0.04%) | (0.12%) | (0.27%) |
Valuation allowance | $ 121,859,000 | $ 74,959,000 | $ 44,900,000 | $ 27,500,000
Interest accrued in relation to uncertain tax positions | 0 |  |  |
Penalties accrued in relation to uncertain tax positions | 0 |  |  |
Domestic Tax Authority |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards for tax purposes | $ 462,100,000 |  |  |
Operating loss carryforwards earliest expiration year | 2034 |  |  |
Operating loss carryforwards latest expiration year | 2037 |  |  |
Net operating loss carryforwards expiring in indefinite period for tax purposes | $ 335,900,000 |  |  |
Domestic Tax Authority | Tax Period Expire from 2034 through 2037 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards for tax purposes | $ 126,200,000 |  |  |
State and Local Jurisdiction |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating loss carryforwards earliest expiration year | 2034 |  |  |
Operating loss carryforwards latest expiration year | 2040 |  |  |
State and Local Jurisdiction | Tax Period Expire from 2034 through 2040 |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards for tax purposes | $ 78,700,000 |  |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Amount of statutory penalties accrued for a tax position claimed or expected to be claimed by the entity, in its tax return. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of interest expense accrued for an underpayment of income taxes. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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