Revenue Recognition - Summary of Accounts Receivable Balances by Reportable Segments (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accounts Receivable Balances By Reportable Segments [Line Items]
Accounts receivable, gross	$ 37,210	$ 26,061
Allowance for doubtful accounts, chargebacks, and other deductions	(20,042)	(13,110)
Accounts receivable, net	17,168	12,951
Global Supply Chain Platform
Accounts Receivable Balances By Reportable Segments [Line Items]
Accounts receivable, gross	4,888	7,814
Allowance for doubtful accounts, chargebacks, and other deductions	(120)	(9)
Accounts receivable, net	4,768	7,805
Commercial Platform
Accounts Receivable Balances By Reportable Segments [Line Items]
Accounts receivable, gross	32,322	18,247
Allowance for doubtful accounts, chargebacks, and other deductions	(19,922)	(13,101)
Accounts receivable, net	$ 12,400	$ 5,146