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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Accrued Liabilities, Current [Abstract]    
Compensation and benefits $ 2,731 $ 6,225
Consulting and other vendors 2,188 895
Other 610 539
Lease liability 1,033 0
Royalties 539 498
Legal and professional fees 311 432
Deferred rent 0 391
Taxes and other assessments 519 383
Interest 251 256
Total $ 8,182 $ 9,619