Balance Sheet Account Detail - Schedule of Accounts Payable and Other Accrued Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Trade accounts payable and other accrued liabilities	$ 33,648	$ 30,488
Accrued rebates	7,990	8,350
Accrued product royalty	4,339	4,723
Allowance for returns	4,045	2,309
Accrued data and distribution fees	4,305	4,222
Accrued GPO administrative fees	296	384
Accrued inventory management fee	1,126	540
Allowance for chargebacks	2,368	1,467
Accounts payable and other accrued liabilities	$ 58,117	$ 52,483