Accounts Receivable

1 Months Ended

Feb. 06, 2013

Accounts Receivable

16. Accounts Receivable

The accounts receivable balance as of December 31, 2012, was $193.5 million (2011: $167.7 million). No allowances for doubtful accounts were required as of December 31, 2012 and 2011.

The following customer or collaborator accounts for more than 10% of our accounts receivable at December 31, 2012 and 2011:

	2012			2011
AmerisourceBergen Corp.		68	%		65	%
Biogen Idec		32	%		35	%

As of December 31, 2012 and 2011 there were no trade receivables past due but not impaired.