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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]    
Compensation and benefits $ 2,779 $ 6,225
Consulting and other vendors 2,172 895
Other 355 539
Lease liability 1,042 0
Royalties 662 498
Legal and professional fees 313 432
Deferred rent   391
Taxes and other assessments 650 383
Interest 121 256
Total $ 8,094 $ 9,619