Accounts Payable and Accrued Expenses - Summary of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accounts payable	$ 1,762	$ 530
Accrued legal, professional fees and other	304	1,262
Accrued vacation	55	54
Accounts payable and accrued expenses, total	$ 2,121	$ 1,846