INCOME TAXES - Deferred taxes (Details) - USD ($) $ in Thousands |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Deferred Tax Assets | ||
| Operating lease liability | $ 420 | $ 541 |
| Stock-based compensation | 6,606 | 3,788 |
| License fee | 594 | 630 |
| Net operating loss carryforwards | 79,429 | 49,094 |
| Research and development tax credits | 14,940 | 9,037 |
| Other | 1,352 | 689 |
| Total Deferred Tax Assets | 103,341 | 63,779 |
| Valuation Allowance | (102,932) | (63,246) |
| Net Deferred Tax Assets | 409 | 533 |
| Deferred Tax Liabilities | ||
| Right of Use Asset | (409) | (533) |
| Net Deferred Tax Liabilities | (409) | (533) |
| Net deferred tax asset (liability) | $ 0 | $ 0 |