Licenses Acquired - Additional Information (Detail) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
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| Research and Development Arrangement, Contract to Perform for Others [Line Items] | ||||
| Research And Development In Process | $ 1 | $ 1,800 | $ 98 | $ 3,094 |
| Caelum [Member] | ||||
| Research and Development Arrangement, Contract to Perform for Others [Line Items] | ||||
| Research And Development In Process | 0 | 0 | 0 | 200 |
| Cyprium [Member] | ||||
| Research and Development Arrangement, Contract to Perform for Others [Line Items] | ||||
| Research And Development In Process | $ 0 | $ 0 | $ 0 | $ 100 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition The amount of purchased research and development assets that are acquired in a business combination have no alternative future use and are therefore written off in the period of acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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