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Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified |
Sep. 30, 2013
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|---|---|
| Assets | |
| Total Assets | $ 47,091 |
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Stock Warrants [Member]
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| Liabilities | |
| Liabilities | 548 |
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Cash [Member]
|
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| Assets | |
| Total Assets | 5,723 |
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Money market securities [Member]
|
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| Assets | |
| Total Assets | 7,541 |
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Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | 33,827 |
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Level 1 [Member]
|
|
| Assets | |
| Total Assets | 13,264 |
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Level 1 [Member] | Cash [Member]
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|
| Assets | |
| Total Assets | 5,723 |
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Level 1 [Member] | Money market securities [Member]
|
|
| Assets | |
| Total Assets | 7,541 |
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Level 2 [Member]
|
|
| Assets | |
| Total Assets | 33,827 |
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Level 2 [Member] | Corporate bonds and commercial paper [Member]
|
|
| Assets | |
| Total Assets | 33,827 |
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Level 3 [Member] | Stock Warrants [Member]
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| Liabilities | |
| Liabilities | $ 548 |