Income Taxes - Additional Information (Details) - USD ($) |
12 Months Ended | |||
---|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
Dec. 31, 2017 |
|
Income Tax Disclosure [Line Items] | ||||
Uncertain tax benefits | $ 393,000 | $ 271,000 | $ 408,000 | $ 119,000 |
Interest or penalties recognized for the period | 0 | $ 0 | ||
Federal | ||||
Income Tax Disclosure [Line Items] | ||||
Net operating loss carryforwards | 186,500,000 | |||
Research credit carryforwards | $ 800,000 | |||
Tax credit carry forwards expiration year | 2039 | |||
Federal | Research | ||||
Income Tax Disclosure [Line Items] | ||||
Research credit carryforward | $ 1,300,000 | |||
State | ||||
Income Tax Disclosure [Line Items] | ||||
Net operating loss carryforwards | $ 148,800,000 | |||
Operating loss carry forwards expiration year | 2034 | |||
California | ||||
Income Tax Disclosure [Line Items] | ||||
Research credit carryforwards | $ 900,000 |