Related Party Transactions - Additional Information (Detail) - Clinical Trial Services - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Related Party Transaction [Line Items] | ||
| Fee incurred for clinical trial services | $ 218,000 | $ 255,000 |
| Accounts Payable | $ 0 | $ 22,000 |