Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information - Quarterly Financial Information (Detail)

v2.4.0.8
Quarterly Financial Information - Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]                      
Collaboration revenue $ 8,604 $ 9,862 $ 6,340 $ 5,076 $ 9,780 $ 6,570 $ 2,429 $ 1,316 $ 29,882 $ 20,095 $ 5,496
Research and development 13,195 18,004 13,263 10,855 15,645 12,895 6,326 5,082 55,317 39,948 21,553
General and administrative 2,446 2,473 2,473 2,500 2,042 1,965 2,047 1,737 9,892 7,791 6,230
Restructuring gain         (1,657)         (1,657)  
Total expenses 15,641 20,477 15,736 13,355 16,030 14,860 8,373 6,819 65,209 46,082 27,783
Other income (expense) 359 561 976 1,582 2,147 2,370 1,729 (1,357) 3,478 4,889 7,614
Net loss $ (6,678) $ (10,054) $ (8,420) $ (6,697) $ (4,103) $ (5,920) $ (4,215) $ (6,860) $ (31,849) $ (21,098) $ (14,673)
Basic and diluted net loss per share $ (0.45) $ (0.68) $ (0.57) $ (0.46) $ (0.28) $ (0.40) $ (0.29) $ (0.67) $ (2.17) $ (1.56) $ (1.51)