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Income Taxes - Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets |  |
Impairments of intangible assets and inventory | $ 644 | $ 1,217
Employee benefits | 724 | 758
Accrued losses on uncompleted contracts | 3,335 | 2,380
Stock based compensation expense | 312 | 266
Allowance for doubtful accounts | 11 | 84
Long-term incentive awards | 0 | 150
Federal net operating losses | 14,885 | 9,962
State net operating losses | 1,678 | 1,155
R&D and other tax credits | 806 | 0
Other | 426 | 395
Total deferred tax assets | 22,821 | 16,367
Deferred tax liabilities |  |
Property, plant and equipment and AHFS | (7,523) | (11,416)
Prepaid insurance | (402) | (450)
Total deferred tax liabilities | (7,925) | (11,866)
Net deferred tax assets | 14,896 | 4,501
Valuation allowance | (15,086) | (4,701)
Net deferred taxes | $ (190) | $ (200)

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