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Net Loss Per Common Share - Calculation of Basic and Diluted Net Loss Per Share (Detail) (USD $)
In Thousands, except 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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| Numerator | |||||||||||||||||
| 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) |
| Number of Shares, Options cancelled | 0 | 0 | 5,861 | 5,861 | |||||||||||||
| Net loss attributed to common stockholders | $ (37,158) | $ (27,610) | $ (42,221) | $ (127,203) | |||||||||||||
| Denominator | |||||||||||||||||
| Weighted-average common shares outstanding-denominator for basic and diluted net loss per share | 30,429,743 | 21,654,984 | 7,662,984 | ||||||||||||||
| Basic and diluted net loss per common share attributed to common stockholders | $ (0.27) | $ (0.24) | $ (0.38) | $ (0.35) | $ (0.36) | $ (0.24) | $ (0.34) | $ (0.35) | $ (1.22) | $ (1.27) | $ (5.51) | ||||||