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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |
Change in valuation allowance | $ 62,000 |
Deferred tax assets, federal net operating loss carryforwards | 136,771,000 |
Deferred tax assets, state net operating loss carryforwards | $ 114,459,000 |
Percentage of annual limitation of taxable income | 80.00% |
State net operating loss carryforward, expiration year | 2028 |
Tax credit carryforward, expiration year | 2039 |
Liabilities for uncertain tax positions | $ 0 | $ 0
Accrued interest or penalties related to uncertain tax positions | 0 | $ 0
Federal |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carryforwards | 6,507,000 |
State |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carryforwards | $ 5,018,000 |
Internal Revenue Service (IRS) |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carryforward limitations on use, cumulative ownership change, period | 3 years |
Tax credit carryforward, limitations on use | an ownership change, as defined by Section 382, results from transactions that increase the ownership of five percent stockholders in the stock of a corporation by more than 50% in the aggregate over a three-year period. |
Internal Revenue Service (IRS) | Minimum |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carryforward limitations on use, cumulative ownership change percentage | 5.00% |
Internal Revenue Service (IRS) | Maximum |  |
Income Tax Disclosure [Line Items] |  |
Tax credit carryforward limitations on use, cumulative ownership change percentage | 50.00% |
Internal Revenue Service (IRS) | Federal |  |
Income Tax Disclosure [Line Items] |  |
Income tax examination year under examination | 2017 |
Closed tax year | 2015 |
Internal Revenue Service (IRS) | State |  |
Income Tax Disclosure [Line Items] |  |
Closed tax year | 2015 |
UK Revenue Agency | Foreign |  |
Income Tax Disclosure [Line Items] |  |
Open tax year | 2016 |
Canada Revenue Agency | Foreign |  |
Income Tax Disclosure [Line Items] |  |
Open tax year | 2016 |
Revenue Commissioners, Ireland | Foreign |  |
Income Tax Disclosure [Line Items] |  |
Open tax year | 2016 |

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