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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Deferred tax assets: |  |  |
Net operating losses | $ 43,626 | $ 14,442 | $ 306
Tax credits, net | 9,196 | 1,131 |
Amortization | 6,597 | 6,267 | 1,588
Lease liability | 2,329 |  |
Accrued compensation | 1,476 | 834 |
Stock-based compensation | 1,388 |  | 1
Other | 383 | 154 |
Total gross deferred tax assets | 64,995 | 22,828 | 1,895
Deferred tax liabilities: |  |  |
Right of use asset | (2,164) |  |
Property, plant and equipment | (57) | (16) |
Stock-based compensation |  | (1,057) |
Total gross deferred tax liabilities | (2,221) | (1,073) |
Valuation allowance | $ (62,774) | $ (21,755) | $ (1,895)

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