Other Long-term Liabilities - Summary of Other Long-term Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Other Long Term Liabilities [Abstract]
Asset retirement obligations (ARO)		$ 397	$ 1,018
Deferred rent	$ 1,125	163
Other liabilities, total	1,125	560
Current maturities of other long-term liabilities	(154)	(409)
Other long-term liabilities	$ 971	$ 151