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

Amount of deferred tax liability attributable to taxable temporary differences.

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