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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 | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2013
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Sep. 30, 2013
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Jun. 30, 2013
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Mar. 31, 2013
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Dec. 31, 2012
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Dec. 31, 2006
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Dec. 31, 2009
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Dec. 31, 2008
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Dec. 31, 2007
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Dec. 31, 2013
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|
| 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) | ||||||