Significant Customers that Accounted for More than Ten Percentage of Total Product Revenue (Detail)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Delrus Inc.
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	19.00%	17.00%
Movaco, S.A.
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	16.00%	18.00%
Etablissement Francais du Sang
Revenue, Major Customer [Line Items]
Percentage of revenue derived from significant customer from Company's total product revenue	16.00%	30.00%