Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	20.00%		24.00%		20.00%
Movaco, S.A.
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	19.00%		21.00%		19.00%
Delrus Inc.
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	12.00%		12.00%		16.00%
Service Francophone Du Sang
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	0.00%	[1]	0.00%	[1]	12.00%

[1] Represents an amount less than 10% of product revenue.