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Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Accrued professional fees $ 437 $ 457
Accrued compensation 266 474
Accrued royalties 155 164
Accrued advertising expenses 99 25
Accrued director compensation and liability insurance 107 102
Other 371 294
Accrued expenses $ 1,435 $ 1,516