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
	Mar. 31, 2019	Mar. 31, 2018
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Concentration risk, percentage	29.00%	41.00%
American Red Cross
Revenue, Major Customer [Line Items]
Concentration risk, percentage	13.00%