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Income Taxes - Narrative (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Operating Loss Carryforwards [Line Items] |  |  |
Federal net operating loss carryforward | $ 74,900,000 |  |
Federal net operating loss carryforward, tax-effected | 15,700,000 |  |
Increase in valuation allowance | 4,700,000 |  |
Total recognized tax benefit | 0 | $ 0 | $ 0
Accrued interest or penalties on unrecognized tax positions | 0 |  |
Federal |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 8,700,000 |  |
Operating loss carryforwards subject to expiration | 11,500,000 |  |
Operating loss carryforwards subject to expiration, tax-effected | 2,400,000 |  |
State |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Tax credit carryforward | 6,900,000 |  |
State net operating loss carryforwards | 94,300,000 |  |
State net operating loss carryforwards, tax-effected | 4,800,000 |  |
State | California |  |  |
Operating Loss Carryforwards [Line Items] |  |  |
Operating loss carryforwards subject to expiration | 21,600,000 |  |
Operating loss carryforwards subject to expiration, tax-effected | $ 1,100,000 |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible domestic operating loss carryforwards. Excludes state and local operating loss carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
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