Segment, Customer and Geographic Information - Significant Customer that Accounted for More than Ten Percentage of Total Product Revenue (Detail) - Customer Concentration Risk - Sales Revenue, Goods, Net	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Concentration risk, percentage	27.00%	39.00%	28.00%	40.00%
American Red Cross
Revenue, Major Customer [Line Items]
Concentration risk, percentage	15.00%	10.00%	14.00%