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Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Accrued Liabilities Current [Abstract]    
Compensation and benefits $ 4,936 $ 4,533
Taxes and other assessments 3,195 3,192
Other 667 504
Deferred rent 482 595
Consulting and other vendors 310 1,414
Interest and final payment fee 207 309
Legal and professional fees 361 386
Royalties 112 41
Total $ 10,270 $ 10,974