| Round | Date | Amount | Investor(s) |
|---|---|---|---|
| Series A | June 1998 | $8.6 million | Mayfield Venrock Associates Abingworth Management |
| Series B | November 1999 | $25 million | E.M. Warburg, Pincus & Co. LLC International BM Biomedicine/Global Biomedical Partners New Medical Technologies Series A Investors |
| Series C | July 2000 | $60 million | CSFB Private Equity International Biotechnology Trust Lombard Odier & Cie Series A & B Investors |
| Series C-1 | December 2002 | $6 million | Biogen Idec |
| Series C-2 | September 2004 | $14 million | Biogen Idec |
| IPO | September 2005 | $42 million | |
| Private Placement | March 2006 | $45.3 million | |
| Public Offering | May 2007 | $21 million |