Accrued Expenses - Schedule of Accrued Expenses (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accrued Liabilities Current [Abstract]
Taxes and other assessments	$ 3,319	$ 2,676
Compensation and benefits	3,620	2,328
Interest and final payment fee	163	1,000
Deferred rent	635	323
Consulting and other vendors	305	1,428
Legal and professional fees	271	243
Deferred revenue	128
Royalties	273	159
Other	212	49
Total	$ 8,926	$ 8,206