License Agreements - Additional Information (Detail) - Advirna [Member] - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | ||
| Annual maintenance fee | $ 100,000 | |
| Royalty payments | 1.00% | |
| Effective license period | 90 days | |
| Research and Development Expenses [Member] | ||
| Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] | ||
| One-time milestone payment | $ 350,000 | |