Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Income Tax Disclosure [Abstract] | ||
| Accrued expenses | $ 148 | $ 107 |
| Stock-based compensation | 2,591 | 2,436 |
| Lease liability | 935 | 945 |
| Other | (823) | (856) |
| Net operating loss carryforwards | 70,936 | 58,073 |
| Research and development credits | 5,291 | 5,984 |
| Total deferred tax assets | 79,078 | 66,689 |
| Valuation allowances | (79,078) | (66,689) |
| Net deferred tax assets | $ 0 | $ 0 |
| X | ||||||||||
- Definition Deferred tax assets tax deferred expense compensation and benefits share based compensation cost noncurrent. No definition available.
|
| X | ||||||||||
- Definition Deferred tax assets tax deferred expense lease liability. No definition available.
|
| X | ||||||||||
- Definition Deferred tax assets tax deferred expense reserves and accruals accrued expenses noncurrent. No definition available.
|
| X | ||||||||||
- Definition Deferred tax liabilities other noncurrent. No definition available.
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Definition Amount, after allocation of valuation allowances and deferred tax liability, of deferred tax asset attributable to deductible differences and carryforwards, without jurisdictional netting. Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible research tax credit carryforwards. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- References No definition available.
|