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Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Statutory Federal income tax rate $ (3,362) $ (2,953)
Tax credits (207) (204)
Stock-based compensation 141 72
Goodwill impairment 392  
Permanent items 4 3
Other 38 90
Change in valuation allowance $ 2,994 $ 2,992