Annual report pursuant to Section 13 and 15(d)

Selected Quarterly Financial Data (Unaudited) (Detail)

v2.4.0.8
Selected Quarterly Financial Data (Unaudited) (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended 90 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, 2006
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Dec. 31, 2007
Dec. 31, 2013
Quarterly Financial Information [Line Items]                                  
Operating expenses $ (9,524) $ (7,504) $ (10,294) $ (8,458) $ (8,299) $ (5,831) $ (6,465) $ (6,581)   $ (35,780) $ (27,176) $ (35,044)         $ (115,817)
Other income/(expense) (274) (328) (376) (400) (365) (104) 10 25                  
Net loss $ (9,798) $ (7,832) $ (10,670) $ (8,858) $ (8,664) $ (5,935) $ (6,455) $ (6,556) $ (123) $ (37,158) $ (27,610) $ (36,360) $ (9,982) $ (3,666) $ (3,799) $ (2,644) $ (121,342)
Basic and diluted net loss per common share $ (0.27) $ (0.24) $ (0.38) $ (0.35) $ (0.36) $ (0.24) $ (0.34) $ (0.35)   $ (1.22) $ (1.27) $ (5.51)