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Income Taxes - Deferred Income Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax assets: |  |
Net operating loss carryforwards | $ 4,564 | $ 4,924
Research and AMT credits | 2,208 | 2,074
Stock based compensation | 387 | 327
Accrued and other | 748 | 651
Deferred Tax Assets, Gross | 7,907 | 7,976
Less valuation allowance | (7,455) | (7,659)
Deferred tax assets, net of allowance | 452 | 317
Deferred tax liabilities: |  |
Fixed assets | (288) | (192)
Goodwill | (216) | (163)
Deferred tax liabilities | (504) | (355)
Total deferred tax liabilities | $ (52) | $ (38)

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