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Significant Accounting Policies - Summary of Receivables (Detail) (USD $)
In Thousands, unless otherwise specified
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Dec. 31, 2013
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Dec. 31, 2012
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
|
| Total receivables |
$ 2,115 |
$ 4,562 |
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U.S. Department of Health and Human Services [Member]
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|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
663 |
4,038 |
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Shionogi & Co. Ltd [Member]
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|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
452 |
524 |
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Billed [Member]
|
|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
542 |
674 |
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Billed [Member] | U.S. Department of Health and Human Services [Member]
|
|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
90 |
150 |
|
Billed [Member] | Shionogi & Co. Ltd [Member]
|
|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
452 |
524 |
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Unbilled [Member]
|
|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
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| Total receivables |
1,573 |
3,888 |
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Unbilled [Member] | U.S. Department of Health and Human Services [Member]
|
|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
|
|
| Total receivables |
1,573 |
3,888 |
|
Unbilled [Member] | Shionogi & Co. Ltd [Member]
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|
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| Financing Receivable, Recorded Investment, Past Due [Line Items] |
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| Total receivables |
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