Balance Sheet Account Detail - Schedule of Accounts Payable and Other Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trade accounts payable and other accrued liabilities	$ 29,370	$ 33,648
Accrued rebates	6,904	7,990
Accrued product royalty	3,427	4,339
Allowance for returns	4,378	4,045
Accrued data and distribution fees	3,036	4,305
Accrued GPO administrative fees	230	296
Accrued inventory management fee	799	1,126
Allowance for chargebacks	1,742	2,368
Accounts payable and other accrued liabilities	$ 49,886	$ 58,117