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Income Taxes - Additional Information (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 22, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes Disclosure [Line Items] |  |  |  |
Federal statutory income tax rate, percent |  |  | 21.00% | 34.00%
Percentage of net operating loss carryforwards |  |  | 80.00% |
Tax cuts and jobs act of 2017 change in tax rate income tax expense benefit | $ 0 |  |  |
Valuation allowance |  | $ 40,221,000 | $ 15,395,000 |
Operating loss carryforwards, limitations on use |  | $14.0 million will begin to expire in 2036 and $113.0 million can be carried forward indefinitely. |  |
Operating loss carryforward expiration in two thousand thirty six |  | $ 14,000,000 |  |
Operating loss carryforward indefinitely |  | 113,000,000 |  |
Uncertain tax positions |  | 0 |  |
Penalties and interest accrued |  | 0 |  |
Federal |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 127,000,000 |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2036 |  |
Federal | Research Credits |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Tax credit carryforward, amount |  | $ 3,800,000 | 900,000 |
Tax credit carryforward, expiration date |  | Dec. 31, 2037 |  |
State |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Operating loss carryforwards |  | $ 130,800,000 |  |
Operating loss carryforwards, expiration date |  | Dec. 31, 2036 |  |
State | Research Credits |  |  |  |
Income Taxes Disclosure [Line Items] |  |  |  |
Tax credit carryforward, amount |  | $ 500,000 | $ 200,000 |
Tax credit carryforward, expiration date |  | Dec. 31, 2032 |  |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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