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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables And Accruals [Abstract]    
Accrued professional fees $ 457 $ 401
Accrued compensation 474 200
Accrued royalties 164 152
Accrued advertising expenses 25 76
Accrued director compensation and liability insurance 102 70
Other 294 381
Accrued expenses $ 1,516 $ 1,280