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Income Taxes - Schedule of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets: |  |
Net operating loss (NOL) | $ 78,464 | $ 50,663
Intangibles | 1,495 | 1,252
Share-based compensation | 3,295 | 2,704
Interest | 311 | 0
Inventory reserve | 2,262 | 1,509
Other | 2,024 | 204
Total gross deferred tax assets | 87,851 | 56,332
Deferred Tax liabilities: |  |
Property, plant and equipment | 1,773 | 904
Other | 0 | 0
Total gross deferred tax liabilities | 1,773 | 904
Valuation allowance | 86,078 | 55,428
Net deferred tax assets (liabilities) | $ 0 | $ 0

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