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Quarterly Financial Information (Unaudited) - Summary of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended | 12 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, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Quarterly Financial Information Disclosure [Abstract] | |||||||||||
| Revenues | $ 10,567 | $ 2,389 | $ 821 | $ 3,554 | $ 4,101 | $ 5,761 | $ 4,210 | $ 12,221 | $ 17,331 | $ 26,293 | $ 19,643 |
| Net loss | $ (5,429) | $ (8,001) | $ (12,172) | $ (4,506) | $ (11,053) | $ (9,700) | $ (12,276) | $ (6,052) | $ (30,108) | $ (39,081) | $ (56,948) |
| Basic and diluted net loss per share | $ (0.09) | $ (0.14) | $ (0.23) | $ (0.09) | $ (0.22) | $ (0.19) | $ (0.25) | $ (0.13) | $ (0.55) | $ (0.79) | $ (1.26) |