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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 4,975 $ 4,533
Other 814 504
Deferred rent 437 595
Legal and professional fees 400 386
Consulting and other vendors 299 1,414
Taxes and other assessments 190 3,192
Interest 159 309
Royalties 158 41
Total $ 7,432 $ 10,974