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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Payables And Accruals [Abstract]    
Accrued professional fees $ 401 $ 429
Accrued compensation 200 170
Accrued royalties 152 275
Accrued advertising expenses 76 134
Accrued director compensation and liability insurance 70 70
Other 381 355
Accrued expenses $ 1,280 $ 1,433