Future Minimum Payments Under Loans Payable (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Debt Disclosure [Abstract]
2016 (9 months remaining)	$ 3,199
2017	4,645
2018	4,269
Long-term Debt, Gross, Total	12,113
Less amount representing interest	(1,572)
Less discount	(445)
Less deferred charges	(540)
Less current portion Loans Payable Current	(3,019)	$ (2,053)
Loans payable, net of current portion and discount	$ 6,537	$ 7,418