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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 6,225 $ 4,533
Consulting and other vendors 895 1,414
Other 539 504
Royalties 498 41
Legal and professional fees 432 386
Deferred rent 391 595
Taxes and other assessments 383 3,192
Interest 256 309
Total $ 9,619 $ 10,974