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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 2,125 $ 6,225
Consulting and other vendors 1,933 895
Other 646 539
Lease liability 733  
Royalties 365 498
Legal and professional fees 380 432
Deferred rent   391
Taxes and other assessments 602 383
Interest 260 256
Total $ 7,044 $ 9,619