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Net Loss Per Common Share - Warrants, Options and Purchase Rights Excluded from Computation of Diluted Net Loss Per Share (Detail)
In Thousands, unless otherwise specified |
3 Months Ended | |
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Mar. 31, 2014
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Mar. 31, 2013
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Employee Stock Purchase Plan (ESPP) [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Shares issuable | 31 | 48 |
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Employee Stock Options [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Shares issuable | 6,656 | 6,481 |
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Warrants [Member]
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| Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] | ||
| Shares issuable | 4,288 | 11,573 |