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v3.21.1

Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Impairments of lease assets and inventory | $ 184 | $ 644
Employee benefits | 751 | 724
Accrued losses on uncompleted contracts | 3,716 | 3,335
Stock based compensation expense | 225 | 312
Federal net operating losses | 19,345 | 14,885
State net operating losses | 3,620 | 1,678
R&D and other tax credits | 806 | 806
Other | 631 | 437
Total deferred tax assets | 29,278 | 22,821
Deferred tax liabilities |  |
Property, plant and equipment and AHFS | (5,825) | (7,523)
Prepaid insurance | (512) | (402)
Total deferred tax liabilities | (6,337) | (7,925)
Net deferred tax assets | 22,941 | 14,896
Valuation allowance | (23,054) | (15,086)
Net deferred taxes | $ (113) | $ (190)

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