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Income Taxes - Components of deferred tax asset (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryovers | $ 27,446 | $ 14,305
Stock compensation and other | 2,037 | 1,427
Change in fair value of warrant liabilities | 57 | 45
Amortization of license | 9,454 | 6,258
Lease liability | 746 | 0
Accruals and reserves | 519 | 237
Startup costs | 7 | 6
Debt Issuance Costs | 21 | 0
Tax credits | 2,746 | 1,070
Total deferred tax assets | 43,033 | 23,348
Less valuation allowance | (42,608) | (23,348)
Net deferred tax assets | 425 | 0
Deferred tax liabilities: |  |
Stock compensation and other | 0 | 0
Unrealized gain/loss on investment | 0 | 0
Right of use asset | (425) | 0
Basis in subsidiary | 0 | 0
Total deferred tax assets, net | $ 0 | $ 0

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